| actinoid | (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinide, actinon |
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| adenoid | (noun) a collection of lymphatic tissue in the throat behind the uvula (on the posterior wall and roof of the nasopharynx) | Synonyms: Luschka's tonsil, pharyngeal tonsil, third tonsil, tonsilla adenoidea, tonsilla pharyngealis |
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| albuminoid | (noun) a simple protein found in horny and cartilaginous tissues and in the lens of the eye | Synonyms: scleroprotein |
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| ammonoid | (noun) one of the coiled chambered fossil shells of extinct mollusks | Synonyms: ammonite |
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| arachnoid | (noun) air-breathing arthropods characterized by simple eyes and four pairs of legs | Synonyms: arachnid |
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| (noun) the middle of the 3 meninges | Synonyms: arachnoid membrane |
| arytaenoid | (noun) either of two small cartilages at the back of the larynx to which the vocal folds are attached | Synonyms: arytenoid, arytenoid cartilage |
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| arytenoid | (noun) either of two small cartilages at the back of the larynx to which the vocal folds are attached | Synonyms: arytaenoid, arytenoid cartilage |
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| bioflavinoid | (noun) a vitamin that maintains the resistance of cell and capillary walls to permeation | Synonyms: citrin, vitamin P |
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| carcinoid | (noun) a small tumor (benign or malignant) arising from the mucosa of the gastrointestinal tract; usually associated with excessive secretion of serotonin | - |
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| carotenoid | (noun) any of a class of highly unsaturated yellow to red pigments occurring in plants and animals | - |
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| conoid | (noun) a shape whose base is a circle and whose sides taper up to a point | Synonyms: cone, cone shape |
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| crinoid | (noun) primitive echinoderms having five or more feathery arms radiating from a central disk | - |
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| euglenoid | (noun) marine and freshwater green or colorless flagellate organism | Synonyms: euglenid, euglenophyte |
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| flavonoid | (noun) any of a large class of plant pigments having a chemical structure based on or similar to flavone | - |
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| ganoid | (noun) primitive fishes having thick bony scales with a shiny covering | Synonyms: ganoid fish |
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| hominoid | (noun) a primate of the superfamily Hominoidea | - |
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| humanoid | (noun) an automaton that resembles a human being | Synonyms: android, mechanical man |
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| lanthanoid | (noun) any element of the lanthanide series (atomic numbers 57 through 71) | Synonyms: lanthanide, lanthanon, rare-earth element, rare earth |
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| paranoid | (noun) a person afflicted with paranoia | Synonyms: paranoiac |
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| resinoid | (noun) a plastic containing resins | - |
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| scorpaenoid | (noun) fishes having the head armored with bony plates | Synonyms: scorpaenoid fish |
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| solenoid | (noun) a coil of wire around an iron core; becomes a magnet when current passes through the coil | - |
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| sphenoid | (noun) butterfly-shaped bone at the base of the skull | Synonyms: os sphenoidale, sphenoid bone |
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