| acetanilid | (noun) a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen) | Synonyms: acetanilide, phenylacetamide |
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| annelid | (noun) worms with cylindrical bodies segmented both internally and externally | Synonyms: annelid worm, segmented worm |
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| archiannelid | (noun) small primitive marine worm lacking external segmentation and resembling polychaete larvae | - |
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| chrysomelid | (noun) brightly colored beetle that feeds on plant leaves; larvae infest roots and stems | Synonyms: leaf beetle |
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| cichlid | (noun) freshwater fishes of tropical America and Africa and Asia similar to American sunfishes; some are food fishes; many small ones are popular in aquariums | Synonyms: cichlid fish |
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| comatulid | (noun) free-swimming stalkless crinoid with ten feathery arms; found on muddy sea bottoms | Synonyms: feather star |
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| eyelid | (noun) either of two folds of skin that can be moved to cover or open the eye | Synonyms: lid, palpebra |
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| felid | (noun) any of various lithe-bodied roundheaded fissiped mammals, many with retractile claws | Synonyms: feline |
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| gempylid | (noun) snake mackerels; elongated marine fishes with oily flesh; resembles mackerels; found worldwide | - |
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| invalid | (noun) someone who is incapacitated by a chronic illness or injury | Synonyms: shut-in |
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| leptodactylid | (noun) toothed frogs: terrestrial or aquatic or arboreal | Synonyms: leptodactylid frog |
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| lid | (noun) a movable top or cover (hinged or separate) for closing the opening at the top of a box, chest, jar, pan, etc. | - |
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| (noun) headdress that protects the head from bad weather; has shaped crown and usually a brim | Synonyms: chapeau, hat |
| (noun) either of two folds of skin that can be moved to cover or open the eye | Synonyms: eyelid, palpebra |
| machilid | (noun) wingless insect living in dark moist places as under dead tree trunks; they make erratic leaps when disturbed | Synonyms: jumping bristletail |
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| mustelid | (noun) fissiped fur-bearing carnivorous mammals | Synonyms: musteline, musteline mammal |
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| mytilid | (noun) marine bivalve mollusk having a dark elongated shell; live attached to solid objects especially in intertidal zones | Synonyms: marine mussel |
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| nymphalid | (noun) medium to large butterflies found worldwide typically having brightly colored wings and much-reduced nonfunctional forelegs carried folded on the breast | Synonyms: brush-footed butterfly, four-footed butterfly, nymphalid butterfly |
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| psyllid | (noun) small active cicada-like insect with hind legs adapted for leaping; feeds on plant juices | Synonyms: jumping plant louse, psylla |
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| pyralid | (noun) usually tropical slender-bodied long-legged moth whose larvae are crop pests | Synonyms: pyralid moth |
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| sipunculid | (noun) small unsegmented marine worm that when disturbed retracts its anterior portion into the body giving the appearance of a peanut | Synonyms: peanut worm |
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| solid | (noun) a three-dimensional object, structurally rigid, usually resistant to changes of shape or volume | - |
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| (noun) the state in which a substance has no tendency to flow under moderate stress; resists forces (such as compression) that tend to deform it; and retains a definite size and shape | Synonyms: solid state, solidness |
| (noun) matter that is solid at room temperature and pressure | - |
| symphilid | (noun) minute arthropod often infesting the underground parts of truck-garden and greenhouse crops | Synonyms: garden centipede, garden symphilid, Scutigerella immaculata |
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| trombiculid | (noun) mite that as nymph and adult feeds on early stages of small arthropods but whose larvae are parasitic on terrestrial vertebrates | - |
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