1. *stereo- solid, cubic: stereotype, stereosonic, stereotelevision, stereography
2. –still-, -stil- drop: instill, distill, distillation
3. –stimul- spur: stimulate, stimulant
4. *–stitut- set up: institute, institution, destitute, prostitute, restitute
5. –stor-: erect, set up: restoration
6. -strat- level: stratosphere, stratify
7. –strenu- active: strenuous
8. *–string-, -strict-, -strain, -straint, -stress draw tight: stringent, constriction, restrict, constrain, constraint, restraint, distress
9. *–stru-, -struct- build: construe, construct, deconstruction, instrument, obstruct, structure, superstructure, infrastructure, obstruction
10. –stud- zealous, eager: study, studious
11. –stult- stupid: stultify
12. styl- 1) style: stylist, stylistics 2) pointed: stylography
13. –suad-, -suas- advise: persuade, persuasion, dissuasive
14. *sub- [suc- before c; suf- before f; sug- before g; sum- before m; sup- before p; sur- before r, sus- before c, p, t] 1) under, beneath, below, from beneath: subvert, submarine, subsolar, succeed, suffer, suggest, suppose, surrogate, sustain 2) lower in rank, position, or importance than: subhead, subtitle 3) to a lesser degree than, somewhat: subhuman, subtropical, subsonic 4) so as to form a division into smaller or less important parts: subdivide, subfamily 5) near, bordering on: subalpine 6) nearly, almost: subteen 7) [in chemical terms]: 低（含量）: subcarbide, suboxide, subsulphide
15. *suc- see sub-
16. –sud- sweat: sudatory, sudation
17. *suf- see sub-
18. *sug- see sub-
19. sui- oneself: suicide, suicidal
20. –sulphur- brimstone: sulphurous
21. –sult- talk: consult, result, desultory
22. *–sum-, -sumpt- take: assume, presume, presumption, consumer
23. –summ- sum: summary, summarize
24. *sup- see sub-
25. *super- 1) over, above, on top of: supersede, supervise 2) higher in rank or position than: superintendant 3) greater in quality, amount or degree than: superpower, supermarket, supersecrecy 4) to a degree greater than normal: supercharge, supersaturate 5) extra, additional: supertax
26. –super- conquer: insuperable
27. supra- above, over, beyond, before: suprastructure, supranational, supramundane
28. *sur- 1) over, upon, above, beyond: surrealism, surface, surpass, surcharge, surmount, surplus 2)
see sub-
29. *–surg- rise: surge, resurgent, insurgency
30. *sus- see sub-
31. *syl- see syn-
32. *sym- see syn-
33. *syn- with, together, at the same time: [syl- before l] syllogism [sym- before b, m, p] sympathy, symmetry, symphony, symbiosis [otherwise syn-] synchronize, syntony, synthesis, synonym
34. –tabul- table: tabulate, tabular
35. –tac-, -tic- silent: tacit, taciturn, reticent
36. *–tang-, -tag-, -tig-, -tact- touch: tangible, contagious, contiguity, intact, contagion, contiguous, intangible, tag, tactility
37. –tard- late: retard, tardy
38. *techno- of technology: technocrat
39. –tect- cover: detect, protect
40. *tele- far or relating to television: televise, telescope, telepathy, telephoto, telephone, teleplay, telescript
41. –tempor- time: temporal, contemporary, extempore, extemporize, contemporize, contemporaneous, temporal, temporize
42. –tempt- test: tempt, attempt
43. *–ten-, -tin-, -tain-, -tent- hold, keep: contain, abstinence, continent, content, detainee, retain
44. *–tend-, -tens-, -tent- stretch: extend, extent, extensive, attend, attention, contend, tent, tendency, tension, intensify, intensive, distend, distension
45. –tenebr- dark: tenebrous
46. –tenu- thin: tenuous, attenuate, extenuation
47. *–termin- border: terminal, determine, terminate, exterminate
48. ter- three: tertiary
49. terato- 畸形: teratogeny
50. *–terr- 1) earth, land: territory, terrestrial, inter, disinter, exterritorial, extraterrestrial, terrace, terrain, interment, subterrane, subterraneous, Mediterranean 2) frighten: terrify, terrorist, deter, deterrent, determent, terrorize
51. –test- witness: attest, protest, contest
52. *tetra- [tetr- before a vowel] four: tetracycline, tetragon, tetroxide
53. –text- weave: textile, text, subtext, textual, pretext, intertexture
54. *–th 1): cardinal number: ninth 2) abstract nouns: stealth, width, length, strength, growth, breadth （不影响重⾳）/W/
55. –thanas- death: euthanasia
56. *–the- god: theology, theologian, atheism, apotheosis, pantheism, monotheistic, ditheism, polutheism
57. *–therapy treatment: radiotherapy, psychotherapy （重⾳’therapy）/Wer[pi/
58. –therapeutical adj. of n. ending in therapy: radiotherapeutical （重⾳thera’peutical）/Wer[pju:tikl/
59. *–therm- heat: thermolysis, thermometer, thermos, thermometer, thermodynamics, thermonuclear, diathermal, isotherm, synthermal
60. thi- 硫: thiamin
61. *–tic n. of words ending in –t, -y, etc: ecstatic, democratic, cinematic, syntactic （重⾳’- tic）/tik/
62. *-tight impervious to: watertight, airtight （不影响重⾳）
63. –tim- fear: timid, intimidate, timorouse
64. *–tion v. → n.: question, invention, visitation （重⾳’- tion）/Fn/，但在s后/tFn/
65. –tir- draw, pull: retire, tirade
66. *-tive adj. of n. ending in –tion: inventive, preventative （重⾳同原动词）/tiv/
67. –toler- bear, endure: tolerant, tolerate
68. –tom- cut: atom, anatomy, subatomic, tome, appendectomy, enterotomy
69. *–ton- sound, thunder: detonate, tonal, intone, monotony, monotonous, intonation, baritone, semitone, tonal, tonality, diatonic
70. –tonia tension: myotonia
71. –tons- shave: tonsure
72. *–torqu-, -tort- twist: torque, distortion, extortion, retort, torture, torment, tormentor, contortion, distortionist, retort, tortuous, tortile
73. –tot- whole: total, totality
74. –tour- turn: tourism, detour, contour
75. –tox- poison: toxic, intoxicate, toxin, toxicide, detoxify, toxicology, toxicity, antitoxic
76. tra- =trans-: tradition, trajectory
77. *–tract-, -treat- draw, pull: tractor, distract, distraction, attractive, entreat, retreat, abstract, abstraction, contract, contractor, protract, protraction, retract, protractile, subtract
78. *trans- across, beyond, change into another form: transaction, transparent, transcendent, transatlantic, transform, transposition, transfuse, transplant
79. –trem- shake: tremor, tremble
80. *tri- three: tricycle, triplicate, tricolor, tricar, trinity
81. –tribut- give: tribute, attribute, contribute
82. tricho- hair: trichopathy
83. –trop- 向性，趋向性: phototropism
84. *–trud-, -trus- thrust: intrude, obtrusive, extrude, extrusion, protrusive, detrude
85. tubi- tube: tubiform
86. –tum- swell: tumor
87. *–turb- disorder: perturb, imperturbability, disturb, turbine, disturbance, turbulent
88. *Turco- of Turkey: Turco-Cypriot
89. *–ture- [also -ature] n. action, result, condiction: mixture, fixture, curvature, miniature （不影响重⾳）
90. -tut-, -tuit- watch: tutor, tutelary, tuition, tutorial
91. *–ty 1) n. [added to adj.]: surety, certainty, subtlety, cruelty, novelty 2) in numbers: sixty （不影响重⾳）/ti/
92. tyrann- king: tyrant, tyranny
93. *twi- two: twice, twilight, twifold
94. typo- type: typology
95. *–ular adj. of some n. ending in –ule or –le: muscular, particular, capsular （重⾳’ - ular）/jul[/
96. *–ule n. diminutive: capsule, ridicule, granule （通常重⾳’ - - ule）/jul/
active词根词缀
97. *–ulate diminutive of v.: undulate, ejaculate, regulate
98. *ultra- [positive] beyond, extremely; ulterior [comparative]; ultimo- [superlative]: ultraviolet, ultra-right, ultramilitant, ultraviolet, ultimate, ultimatum
99. –umbr- shade: umbrella, adumbrate, umbra, penumbra, inumbrate
100. *un- 1) [in words of non-Latin, non-Greek origin] not, lack of, the opposite of: unconscious, unconcern, unreason, unwanted 2) back, the reverse or removal of [added to v.]: undeceive, unlearn, unbind, unfasten, unlock, unearth, unbosom
101. –und- wave: undulate, abundant, abound
102. *under- 1) in, on, to or from a lower place or side; beneath or below: undertow, underworld, underwear, underground, underline, underwear, underskirt 2) in an inferior or subordinate position or rank: underling, undersecretary 3) too little, not enough, bwloe normal or standard: underdeveloped, underpaid, underachiever, underspend, undersupply, underdose
103. *uni- one: universe, uniform, unify, unite, unity, uniform, unit, unique, unification, unison, unicycle, unilateral
104. *up- upwards: uplift, upstairs, upward
105. –ur- urine: glycouria, polyuria, uropenia, urine, urinate, urinal, uroscopy, urology
106. *–urb- city: urban, urbane, conurbation
107. *–ure n. act, condition, state: picture, tenure, exposure, composure, disclosure （通常重⾳’- ure）/[/
108. –urg- press hard: urge, urgent
109. *–ut-, -us- use: utility, usage, abuse, misuse, abusive, inutile, utensil
110. *–vac- empty: vacuum, vacate, vacancy, evacuate, vacation, vacuous, vacuity, evacuee, vacuumize
111. *–vad-, -vas- go: invade, evasive, pervade, pervasive, invasion
112. *–vag- wander: vagrant, vagabond, vague, extravagant, extravagance, divagate
113. *–val- be worth, be strong: value, valor, valiant, valid, invalid, validity, convalesce, convalescent, valorous
114. –van- empty: vanish, vanity, vain, evanesce, evanescent
115. -vandal- destruction: vandalism, vandalize
116. –vari- c h a n g e : v a r i e t y , i n v a r i a b l e , v a r i e d , v a r i a n t , v a r i a n c e , , v a r i f o r m / p >