| strawworm | (noun) larva of chalcid flies injurious to the straw of wheat and other grains | Synonyms: jointworm |
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| (noun) larva of the caddis fly; constructs a case of silk covered with sand or plant debris | Synonyms: caddisworm |
| tapeworm | (noun) ribbonlike flatworms that are parasitic in the intestines of humans and other vertebrates | Synonyms: cestode |
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| threadworm | (noun) small threadlike worm infesting human intestines and rectum especially in children | Synonyms: Enterobius vermicularis, pinworm |
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| thunderstorm | (noun) a storm resulting from strong rising air currents; heavy rain or hail along with thunder and lightning | Synonyms: electric storm, electrical storm |
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| transform | (verb) change or alter in form, appearance, or nature | Synonyms: transmute, transubstantiate |
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| (verb) change from one form or medium into another | Synonyms: translate |
| (verb) subject to a mathematical transformation | - |
| (verb) change in outward structure or looks | Synonyms: metamorphose, transmute |
| (verb) increase or decrease (an alternating current or voltage) | - |
| (verb) change (a bacterial cell) into a genetically distinct cell by the introduction of DNA from another cell of the same or closely related species | - |
| (verb) convert (one form of energy) to another | - |
| umbelliform | (adjective) resembling or in the form of an umbel | - |
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| underperform | (verb) perform too rarely | - |
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| (verb) perform less well or with less success than expected | Synonyms: underachieve |
| uniform | (adjective) always the same; showing a single form or character in all occurrences | Synonyms: unvarying |
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| (adjective) not differentiated | Synonyms: undifferentiated |
| (adjective) the same throughout in structure or composition | Synonyms: consistent |
| (adjective) evenly spaced | - |
| (noun) clothing of distinctive design worn by members of a particular group as a means of identification | - |
| (verb) provide with uniforms | - |
| varicelliform | (adjective) resembling the rash of chickenpox | - |
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| variform | (adjective) varying in form or shape | - |
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| vasiform | (adjective) constituting a tube; having hollow tubes (as for the passage of fluids) | Synonyms: cannular, tube-shaped, tubelike, tubular |
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| vermiform | (adjective) resembling a worm; long and thin and cylindrical | Synonyms: worm-shaped |
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| vetchworm | (noun) larva of a noctuid moth; highly destructive to especially corn and cotton and tomato crops | Synonyms: corn earworm, cotton bollworm, Heliothis zia, tobacco budworm, tomato fruitworm |
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| waveform | (noun) the shape of a wave illustrated graphically by plotting the values of the period quantity against time | Synonyms: wave form, wave shape |
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| webworm | (noun) several gregarious moth larvae that spin webs over foliage on which they feed | - |
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| wheatworm | (noun) small roundworm parasitic on wheat | Synonyms: Tylenchus tritici, wheat eel, wheat eelworm |
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| windstorm | (noun) a storm consisting of violent winds | - |
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| wireworm | (noun) wormlike larva of various elaterid beetles; feeds on roots of many crop plants | - |
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| woodworm | (noun) a larva of a woodborer | - |
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| worm | (noun) any of numerous relatively small elongated soft-bodied animals especially of the phyla Annelida and Chaetognatha and Nematoda and Nemertea and Platyhelminthes; also many insect larvae | - |
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| (noun) screw thread on a gear with the teeth of a worm wheel or rack | - |
| (noun) a software program capable of reproducing itself that can spread from one computer to the next over a network | - |
| (noun) a person who has a nasty or unethical character undeserving of respect | Synonyms: dirt ball, insect, louse |
| (verb) to move in a twisting or contorted motion, (especially when struggling) | Synonyms: squirm, twist, wrestle, wriggle, writhe |