| larva | | |
| n. (animal) | 1. larva | the immature free-living form of most invertebrates and amphibians and fish which at hatching from the egg is fundamentally unlike its parent and must metamorphose. |
| ~ animal, animate being, beast, creature, brute, fauna | a living organism characterized by voluntary movement. |
| ~ ascidian tadpole | free-swimming larva of ascidians; they have a tail like a tadpole that contains the notochord. |
| ~ bladder worm | encysted saclike larva of the tapeworm. |
| ~ cercaria | tadpole-shaped parasitic larva of a trematode worm; tail disappears in adult stage. |
| ~ wireworm | wormlike larva of various elaterid beetles; feeds on roots of many crop plants. |
| ~ mealworm | the larva of beetles of the family Tenebrionidae. |
| ~ wiggler, wriggler | larva of a mosquito. |
| ~ jointworm, strawworm | larva of chalcid flies injurious to the straw of wheat and other grains. |
| ~ ant lion, antlion, doodlebug | the larva of any of several insects. |
| ~ aphid lion, aphis lion | carnivorous larva of lacewing flies. |
| ~ dobson, hellgrammiate | large brown aquatic larva of the dobsonfly; used as fishing bait. |
| ~ caseworm | insect larva that constructs a protective case around its body. |
| ~ caterpillar | a wormlike and often brightly colored and hairy or spiny larva of a butterfly or moth. |
| ~ nymph | a larva of an insect with incomplete metamorphosis (as the dragonfly or mayfly). |
| ~ leptocephalus | slender transparent larva of eels and certain fishes. |
| ~ bot | botfly larva; typically develops inside the body of a horse or sheep or human. |
| ~ grub | a soft thick wormlike larva of certain beetles and other insects. |
| ~ polliwog, pollywog, tadpole | a larval frog or toad. |
| maggot | | |
| n. (animal) | 1. maggot | the larva of the housefly and blowfly commonly found in decaying organic matter. |
| ~ grub | a soft thick wormlike larva of certain beetles and other insects. |
| worm | | |
| n. (animal) | 1. worm | 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. |
| ~ invertebrate | any animal lacking a backbone or notochord; the term is not used as a scientific classification. |
| ~ helminth, parasitic worm | worm that is parasitic on the intestines of vertebrates especially roundworms and tapeworms and flukes. |
| ~ woodworm | a larva of a woodborer. |
| ~ acanthocephalan, spiny-headed worm | any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines. |
| ~ arrowworm, chaetognath | 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. |
| ~ flatworm, platyhelminth | parasitic or free-living worms having a flattened body. |
| ~ nemertean, nemertine, proboscis worm, ribbon worm | soft unsegmented marine worms that have a threadlike proboscis and the ability to stretch and contract. |
| ~ beard worm, pogonophoran | slender animal with tentacles and a tubelike outer covering; lives on the deep ocean bottom. |
| ~ nematode, nematode worm, roundworm | unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic. |
| ~ annelid, annelid worm, segmented worm | worms with cylindrical bodies segmented both internally and externally. |
| n. (person) | 2. dirt ball, insect, louse, worm | a person who has a nasty or unethical character undeserving of respect. |
| ~ disagreeable person, unpleasant person | a person who is not pleasant or agreeable. |
| n. (communication) | 3. worm | a software program capable of reproducing itself that can spread from one computer to the next over a network.; "worms take advantage of automatic file sending and receiving features found on many computers" |
| ~ malevolent program | a computer program designed to have undesirable or harmful effects. |
| n. (artifact) | 4. worm | screw thread on a gear with the teeth of a worm wheel or rack. |
| ~ screw | a fastener with a tapered threaded shank and a slotted head. |
| ~ worm gear | gear consisting of a shaft with screw thread (the worm) that meshes with a toothed wheel (the worm wheel); changes the direction of the axis of rotary motion. |
| v. (motion) | 5. squirm, twist, worm, wrestle, wriggle, writhe | to move in a twisting or contorted motion, (especially when struggling).; "The prisoner writhed in discomfort"; "The child tried to wriggle free from his aunt's embrace" |
| ~ move | move so as to change position, perform a nontranslational motion.; "He moved his hand slightly to the right" |
| ~ wrench | make a sudden twisting motion. |
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