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

disagreeable person, unpleasant person - a person who is not pleasant or agreeable

malevolent program - a computer program designed to have undesirable or harmful effects

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

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