| medusoid | (adjective) relating to or resembling a medusa | - |
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| (noun) one of two forms that coelenterates take: it is the free-swimming sexual phase in the life cycle of a coelenterate; in this phase it has a gelatinous umbrella-shaped body and tentacles | Synonyms: medusa, medusan |
| meloid | (noun) beetle that produces a secretion that blisters the skin | Synonyms: blister beetle |
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| metalloid | (adjective) of or being a nonmetallic element that has some of the properties of metal | - |
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| meteoroid | (noun) (astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere | Synonyms: meteor |
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| micrometeoroid | (noun) a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere | Synonyms: micrometeor, micrometeorite |
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| mineralocorticoid | (noun) hormone that is one of the steroids of the adrenal cortex that influences the metabolism of sodium and potassium | - |
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| mongoloid | (adjective) (offensive) of or relating to or suffering from Down syndrome | - |
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| (adjective) characteristic of or resembling a Mongol | - |
| (noun) a person suffering from Down syndrome (no longer used technically in this sense, now considered offensive) | - |
| monoploid | (adjective) of a cell or organism having a single set of chromosomes | Synonyms: haploid, haploidic |
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| mucinoid | (adjective) resembling mucin | - |
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| mucoid | (adjective) relating to or resembling mucus | Synonyms: mucoidal |
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| (noun) any of several glycoproteins similar to mucin | - |
| myeloid | (adjective) of or relating to bone marrow | - |
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| (adjective) of or relating to bone marrow cells | Synonyms: myelic |
| (adjective) marrowlike | - |
| myoid | (adjective) resembling muscle | - |
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| nonsteroid | (noun) an organic compound that does no contain a steroid | Synonyms: nonsteroidal |
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| ovoid | (adjective) rounded like an egg | Synonyms: egg-shaped, elliptic, elliptical, oval-shaped, oval, ovate, oviform, prolate |
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| (noun) an egg-shaped object | - |
| paraboloid | (noun) a surface having parabolic sections parallel to a single coordinate axis and elliptic sections perpendicular to that axis | - |
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| paranoid | (adjective) suffering from paranoia | - |
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| (noun) a person afflicted with paranoia | Synonyms: paranoiac |
| parathyroid | (noun) any one of four endocrine glands situated above or within the thyroid gland | Synonyms: parathyroid gland |
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| paratyphoid | (noun) any of a variety of infectious intestinal diseases resembling typhoid fever | Synonyms: paratyphoid fever |
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| percoid | (noun) any of numerous spiny-finned fishes of the order Perciformes | Synonyms: percoid fish, percoidean |
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| petaloid | (adjective) resembling a flower petal | - |
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| placoid | (adjective) as the hard flattened scales of e.g. sharks | Synonyms: platelike |
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| planetoid | (noun) any of numerous small celestial bodies that move around the sun | Synonyms: minor planet |
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| polyploid | (adjective) of a cell or organism having more than twice the haploid number of chromosomes | - |
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| (noun) (genetics) an organism or cell having more than twice the haploid number of chromosomes | - |
| prismatoid | (noun) a polyhedron whose vertices all lie in one or the other of two parallel planes; the faces that lie in those planes are the bases of the prismatoid | - |
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| prismoid | (noun) a prismatoid whose bases are polygons having the same number of sides and whose other faces are trapezoids or parallelograms | - |
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| rectosigmoid | (adjective) of or related to or near the sigmoid colon and the upper part of the rectum | - |
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| resinoid | (noun) a plastic containing resins | - |
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| rheumatoid | (adjective) of or pertaining to arthritis | Synonyms: arthritic, creaky, rheumatic, rheumy |
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| rhizoid | (noun) any of various slender filaments that function as roots in mosses and ferns and fungi etc | - |
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| rhomboid | (adjective) shaped like a rhombus or rhomboid | Synonyms: rhomboidal |
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| (noun) any of several muscles of the upper back that help move the shoulder blade | Synonyms: rhomboid muscle |
| (noun) a parallelogram with adjacent sides of unequal lengths; an oblique-angled parallelogram with only the opposite sides equal | - |
| sarcoid | (adjective) of or relating to or resembling flesh | Synonyms: fleshy |
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| scaphoid | (adjective) shaped like a boat | Synonyms: navicular |
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| schizoid | (adjective) of or relating to or characteristic of schizophrenia | Synonyms: schizophrenic |
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| (adjective) marked by withdrawal and inability to form close relationships | - |
| (noun) characterized by symptoms similar to but less severe than schizophrenia | Synonyms: schizotypal personality |
| scombroid | (noun) important marine food and game fishes found in all tropical and temperate seas; some are at least partially endothermic and can thrive in colder waters | Synonyms: scombroid fish |
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| scorpaenoid | (noun) fishes having the head armored with bony plates | Synonyms: scorpaenoid fish |
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| sepaloid | (adjective) resembling or characteristic of a sepal | Synonyms: sepaline |
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| sesamoid | (noun) any of several small round bones formed in a tendon where it passes over a joint | Synonyms: os sesamoideum, sesamoid bone |
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| sigmoid | (adjective) of or relating to the sigmoid flexure in the large intestine | Synonyms: sigmoidal |
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| (adjective) curved in two directions (like the letter S) | - |
| sinusoid | (noun) tiny endothelium-lined passages for blood in the tissue of an organ | - |
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| (noun) the curve of y=sin x | Synonyms: sine curve |
| solenoid | (noun) a coil of wire around an iron core; becomes a magnet when current passes through the coil | - |
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| spermatozoid | (noun) a motile male gamete of a plant such as an alga or fern or gymnosperm | Synonyms: antherozoid |
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| sphecoid | (noun) any of various solitary wasps | Synonyms: sphecoid wasp |
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| sphenoid | (noun) butterfly-shaped bone at the base of the skull | Synonyms: os sphenoidale, sphenoid bone |
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| spheroid | (noun) a shape that is generated by rotating an ellipse around one of its axes | Synonyms: ellipsoid of revolution |
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| sternocleidomastoid | (noun) one of two thick muscles running from the sternum and clavicle to the mastoid and occipital bone; turns head obliquely to the opposite side; when acting together they flex the neck and extend the head | Synonyms: musculus sternocleidomastoideus, sternocleido mastoideus, sternocleidomastoid muscle |
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| steroid | (noun) any of several fat-soluble organic compounds having as a basis 17 carbon atoms in four rings; many have important physiological effects | - |
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| (noun) any hormone affecting the development and growth of sex organs | Synonyms: sex hormone, steroid hormone |
| tabloid | (noun) newspaper with half-size pages | Synonyms: rag, sheet |
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| (noun) sensationalist journalism | Synonyms: tab, yellow journalism |
| thalloid | (adjective) of or relating to or resembling or consisting of a thallus | - |
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| thyroid | (adjective) suggestive of a thyroid disorder | - |
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| (adjective) of or relating to the thyroid gland | Synonyms: thyroidal |
| (noun) located near the base of the neck | Synonyms: thyroid gland |
| tineoid | (noun) small dull-colored moth with chewing mouthparts | Synonyms: tineoid moth |
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| toroid | (noun) a ring-shaped surface generated by rotating a circle around an axis that does not intersect the circle | Synonyms: torus |
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| (noun) the doughnut-shaped object enclosed by a torus | - |
| toxoid | (noun) a bacterial toxin that has been weakened until it is no longer toxic but is strong enough to induce the formation of antibodies and immunity to the specific disease caused by the toxin | Synonyms: anatoxin |
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| trapezoid | (noun) the wrist bone between the trapezium and the capitate bones | Synonyms: os trapezoideum, trapezoid bone |
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| (noun) a quadrilateral with two parallel sides | - |
| triploid | (adjective) of a cell or organism having three complete sets of chromosomes | - |
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| tuberculoid | (adjective) resembling tuberculosis | - |
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| typhoid | (noun) serious infection marked by intestinal inflammation and ulceration; caused by Salmonella typhosa ingested with food or water | Synonyms: enteric fever, typhoid fever |
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| viroid | (noun) the smallest of viruses; a plant virus with its RNA arranged in a circular chromosome without a protein coat | Synonyms: virusoid |
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| virusoid | (noun) the smallest of viruses; a plant virus with its RNA arranged in a circular chromosome without a protein coat | Synonyms: viroid |
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| void | (adjective) containing nothing | - |
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| (adjective) lacking any legal or binding force | Synonyms: null |
| (noun) an empty area or space | Synonyms: emptiness, vacancy, vacuum |
| (noun) the state of nonexistence | Synonyms: nihility, nothingness, nullity |
| (verb) excrete or discharge from the body | Synonyms: empty, evacuate |
| (verb) take away the legal force of or render ineffective | Synonyms: invalidate, vitiate |
| (verb) clear (a room, house, place) of occupants or empty or clear (a place or receptacle) of something | - |
| (verb) declare invalid | Synonyms: annul, avoid, invalidate, nullify, quash |
| zooid | (noun) one of the distinct individuals forming a colonial animal such as a bryozoan or hydrozoan | - |
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| zymoid | (adjective) resembling an enzyme | - |
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