| angleworm | (noun) terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglers | Synonyms: crawler, dew worm, earthworm, fishing worm, fishworm, nightcrawler, nightwalker, red worm, wiggler |
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| armyworm | (noun) moth whose destructive larvae travel in multitudes | Synonyms: Pseudaletia unipuncta |
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| (noun) noctuid moth larvae that travel in multitudes destroying especially grass and grain | Synonyms: army worm, Pseudaletia unipuncta |
| (noun) larva of fungus gnat that feed on cereals and other grains; they march in large companies in regular order when the food is exhausted | - |
| arrowworm | (noun) any worm of the Chaetognatha; transparent marine worm with horizontal lateral and caudal fins and a row of movable curved spines at each side of the mouth | Synonyms: chaetognath |
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| blindworm | (noun) small burrowing legless European lizard with tiny eyes; popularly believed to be blind | Synonyms: Anguis fragilis, slowworm |
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| (noun) any of the small slender limbless burrowing wormlike amphibians of the order Gymnophiona; inhabit moist soil in tropical regions | Synonyms: caecilian |
| bloodworm | (noun) a segmented marine worm with bright red body; often used for bait | - |
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| bollworm | (noun) any of various moth caterpillars that destroy cotton bolls | - |
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| bookworm | (noun) someone who spends a great deal of time reading | - |
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| (noun) a person who pays more attention to formal rules and book learning than they merit | Synonyms: pedant, scholastic |
| cabbageworm | (noun) toxic green larva of a cabbage butterfly | Synonyms: Pieris rapae |
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| caddisworm | (noun) larva of the caddis fly; constructs a case of silk covered with sand or plant debris | Synonyms: strawworm |
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| cankerworm | (noun) green caterpillar of a geometrid moth; pest of various fruit and shade trees | - |
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| caseworm | (noun) insect larva that constructs a protective case around its body | - |
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| cutworm | (noun) North American moth whose larvae feed on young plant stems cutting them off at the ground | - |
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| earthworm | (noun) terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglers | Synonyms: angleworm, crawler, dew worm, fishing worm, fishworm, nightcrawler, nightwalker, red worm, wiggler |
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| eelworm | (noun) any of various small free-living plant-parasitic roundworms | - |
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| fishworm | (noun) terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglers | Synonyms: angleworm, crawler, dew worm, earthworm, fishing worm, nightcrawler, nightwalker, red worm, wiggler |
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| flatworm | (noun) parasitic or free-living worms having a flattened body | Synonyms: platyhelminth |
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| glowworm | (noun) the luminous larva or wingless grub-like female of a firefly | - |
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| hookworm | (noun) parasitic bloodsucking roundworms having hooked mouth parts to fasten to the intestinal wall of human and other hosts | - |
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| (noun) infestation of the intestines by hookworms which enter the body (usually) through the skin | Synonyms: hookworm disease |
| inchworm | (noun) small hairless caterpillar having legs on only its front and rear segments; mostly larvae of moths of the family Geometridae | Synonyms: looper, measuring worm |
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| jointworm | (noun) larva of chalcid flies injurious to the straw of wheat and other grains | Synonyms: strawworm |
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| lobworm | (noun) marine worms having a row of tufted gills along each side of the back; often used for fishing bait | Synonyms: lug, lugworm |
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| lugworm | (noun) marine worms having a row of tufted gills along each side of the back; often used for fishing bait | Synonyms: lobworm, lug |
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| mealworm | (noun) the larva of beetles of the family Tenebrionidae | - |
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| pinworm | (noun) small threadlike worm infesting human intestines and rectum especially in children | Synonyms: Enterobius vermicularis, threadworm |
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| ringworm | (noun) infections of the skin or nails caused by fungi and appearing as itching circular patches | Synonyms: roundworm, tinea |
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| roundworm | (noun) unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic | Synonyms: nematode, nematode worm |
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| (noun) infections of the skin or nails caused by fungi and appearing as itching circular patches | Synonyms: ringworm, tinea |
| shipworm | (noun) wormlike marine bivalve that bores into wooden piers and ships by means of drill-like shells | Synonyms: teredinid |
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| silkworm | (noun) the commercially bred hairless white caterpillar of the domestic silkworm moth which spins a cocoon that can be processed to yield silk fiber; the principal source of commercial silk | - |
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| (noun) larva of a saturniid moth; spins a large amount of strong silk in constructing its cocoon | Synonyms: giant silkworm, wild wilkworm |
| slowworm | (noun) small burrowing legless European lizard with tiny eyes; popularly believed to be blind | Synonyms: Anguis fragilis, blindworm |
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| splitworm | (noun) greyish-brown moth whose larva is the potato tuberworm | Synonyms: Phthorimaea operculella, potato moth, potato tuber moth |
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| 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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| 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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| 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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| 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 |