| 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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| alkaloid | (noun) natural bases containing nitrogen found in plants | - |
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| ammonoid | (noun) one of the coiled chambered fossil shells of extinct mollusks | Synonyms: ammonite |
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| amphidiploid | (noun) (genetics) an organism or cell having a diploid set of chromosomes from each parent | - |
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| amygdaloid | (noun) volcanic rock in which rounded cavities formed by expanding gas have subsequently become filled with mineral deposits | - |
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| amyloid | (noun) (pathology) a waxy translucent complex protein resembling starch that results from degeneration of tissue | - |
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| (noun) a non-nitrogenous food substance consisting chiefly of starch; any substance resembling starch | - |
| android | (noun) an automaton that resembles a human being | Synonyms: humanoid, mechanical man |
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| (noun) An operating system from Google for mobile devices | - |
| aneroid | (noun) a barometer that measures pressure without using fluids | Synonyms: aneroid barometer |
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| antherozoid | (noun) a motile male gamete of a plant such as an alga or fern or gymnosperm | Synonyms: spermatozoid |
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| anthropoid | (noun) any member of the suborder Anthropoidea including monkeys and apes and hominids | - |
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| (noun) person who resembles a nonhuman primate | Synonyms: ape |
| 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 |
| aroid | (noun) any plant of the family Araceae; have small flowers massed on a spadix surrounded by a large spathe | Synonyms: arum |
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| 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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| asteroid | (noun) any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter) | - |
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| autacoid | (noun) any physiologically active internal secretion especially one of uncertain classification | Synonyms: autocoid |
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| autocoid | (noun) any physiologically active internal secretion especially one of uncertain classification | Synonyms: autacoid |
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| bacteroid | (noun) a rodlike bacterium (especially any of the rod-shaped or branched bacteria in the root nodules of nitrogen-fixing plants) | - |
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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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| blennioid | (noun) elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins | Synonyms: blennioid fish |
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| cancroid | (noun) the most common form of skin cancer | Synonyms: squamous cell carcinoma |
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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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| cardioid | (noun) an epicycloid in which the rolling circle equals the fixed circle | - |
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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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| celluloid | (noun) a medium that disseminates moving pictures | Synonyms: cinema, film |
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| (noun) highly flammable substance made from cellulose nitrate and camphor; used in e.g. motion-picture and X-ray film; its use has decreased with the development of nonflammable thermoplastics | - |
| centroid | (noun) the center of mass of an object of uniform density | - |
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| chancroid | (noun) infectious venereal ulcer | - |
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| cheloid | (noun) raised pinkish scar tissue at the site of an injury; results from excessive tissue repair | Synonyms: keloid |
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| choroid | (noun) a highly vascular membrane in the eye between the retina and the sclera; a dark pigmentation minimizes the scattering of light inside the eye | Synonyms: choroid coat |
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| colloid | (noun) a mixture with properties between those of a solution and fine suspension | - |
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| conchoid | (noun) Any of a family of curves defined as the locus of points p, such that each p is on a line that passes through a given fixed point P and intersects a given curve, C, and the distance from p to the point of intersection with C is a specified constant (note that for nontrivial cases two such points p satisfy the criteria, and the resultant curve has two parts). | - |
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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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| corticoid | (noun) a steroid hormone produced by the adrenal cortex or synthesized; administered as drugs they reduce swelling and decrease the body's immune response | Synonyms: adrenal cortical steroid, corticosteroid |
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| corticosteroid | (noun) a steroid hormone produced by the adrenal cortex or synthesized; administered as drugs they reduce swelling and decrease the body's immune response | Synonyms: adrenal cortical steroid, corticoid |
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| crinoid | (noun) primitive echinoderms having five or more feathery arms radiating from a central disk | - |
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| cuboid | (noun) a rectangular parallelepiped | - |
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| cycloid | (noun) a line generated by a point on a circle rolling along a straight line | - |
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| deltoid | (noun) a large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm | Synonyms: deltoid muscle, musculus deltoideus |
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| demantoid | (noun) a green andradite used as a gemstone | - |
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| diploid | (noun) (genetics) an organism or cell having the normal amount of DNA per cell; i.e., two sets of chromosomes or twice the haploid number | - |
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| ecdysteroid | (noun) #DD: The name 'ecdysteroid' refers to the insect moulting and sex hormones which include ecdysone and its homologues such as 20-hydroxyecdysone. | - |
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| ellipsoid | (noun) a surface whose plane sections are all ellipses or circles | - |
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| epicycloid | (noun) a line generated by a point on a circle rolling around another circle | - |
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| ethmoid | (noun) one of the eight bones of the cranium; a small bone filled with air spaces that forms part of the eye sockets and the nasal cavity | Synonyms: ethmoid bone |
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| euglenoid | (noun) marine and freshwater green or colorless flagellate organism | Synonyms: euglenid, euglenophyte |
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| factoid | (noun) a brief (usually one sentence and usually trivial) news item | - |
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| (noun) something resembling a fact; unverified (often invented) information that is given credibility because it appeared in print | - |
| fibroid | (noun) benign tumor containing fibrous tissue (especially in the uterus) | Synonyms: fibroid tumor |
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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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| fucoid | (noun) any of various algae of the family Fucaceae | Synonyms: fucoid algae |
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| (noun) a fossilized cast or impression of algae of the order Fucales | - |
| gadoid | (noun) a soft-finned fish of the family Gadidae | Synonyms: gadoid fish |
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| ganoid | (noun) primitive fishes having thick bony scales with a shiny covering | Synonyms: ganoid fish |
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| glucocorticoid | (noun) a steroid hormone that is produced by the adrenal cortex of animals; affects functioning of gonads and has anti-inflammatory activity | - |
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| haemorrhoid | (noun) venous swelling external or internal to the anal sphincter | Synonyms: hemorrhoid, piles |
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| haploid | (noun) (genetics) an organism or cell having only one complete set of chromosomes | - |
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| hemorrhoid | (noun) venous swelling external or internal to the anal sphincter | Synonyms: haemorrhoid, piles |
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| heteroploid | (noun) (genetics) an organism or cell having a chromosome number that is not an even multiple of the haploid chromosome number for that species | - |
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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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| hyaloid | (noun) the transparent membrane enveloping the vitreous humor of the eye and separating it from the retina | Synonyms: hyaloid membrane |
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| hydrocolloid | (noun) a substance that forms a gel with water | - |
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| hydroid | (noun) colonial coelenterates having the polyp phase dominant | Synonyms: hydrozoan |
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| hyoid | (noun) a U-shaped bone at the base of the tongue that supports the tongue muscles | Synonyms: hyoid bone, os hyoideum |
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| hyperboloid | (noun) a quadric surface generated by rotating a hyperbola around its main axis | - |
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| hypocycloid | (noun) a line generated by a point on a circle that rolls around inside another circle | - |
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| keloid | (noun) raised pinkish scar tissue at the site of an injury; results from excessive tissue repair | Synonyms: cheloid |
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| ketosteroid | (noun) a steroid containing a ketone group | - |
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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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| lipoid | (noun) an oily organic compound insoluble in water but soluble in organic solvents; essential structural component of living cells (along with proteins and carbohydrates) | Synonyms: lipid, lipide |
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| mastoid | (noun) process of the temporal bone behind the ear at the base of the skull | Synonyms: mastoid bone, mastoid process, mastoidal |
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| medusoid | (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 |
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| meloid | (noun) beetle that produces a secretion that blisters the skin | Synonyms: blister beetle |
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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 | (noun) a person suffering from Down syndrome (no longer used technically in this sense, now considered offensive) | - |
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| mucoid | (noun) any of several glycoproteins similar to mucin | - |
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| nonsteroid | (noun) an organic compound that does no contain a steroid | Synonyms: nonsteroidal |
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| ovoid | (noun) an egg-shaped object | - |
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| 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 | (noun) a person afflicted with paranoia | Synonyms: paranoiac |
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| 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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| planetoid | (noun) any of numerous small celestial bodies that move around the sun | Synonyms: minor planet |
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| polyploid | (noun) (genetics) an organism or cell having more than twice the haploid number of chromosomes | - |
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| 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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| resinoid | (noun) a plastic containing resins | - |
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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 | (noun) any of several muscles of the upper back that help move the shoulder blade | Synonyms: rhomboid muscle |
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| (noun) a parallelogram with adjacent sides of unequal lengths; an oblique-angled parallelogram with only the opposite sides equal | - |
| schizoid | (noun) characterized by symptoms similar to but less severe than schizophrenia | Synonyms: schizotypal personality |
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| 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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| 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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| 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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