| mustelid | (noun) fissiped fur-bearing carnivorous mammals | Synonyms: musteline, musteline mammal |
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| mylodontid | (noun) a variety of extinct edentate | - |
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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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| neritid | (noun) operculate seasnail of coastal waters with a short spiral shell | Synonyms: neritid gastropod |
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| noctuid | (noun) usually dull-colored medium-sized nocturnal moth; the usually smooth-bodied larvae are destructive agricultural pests | Synonyms: noctuid moth, owlet moth |
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| nonsteroid | (noun) an organic compound that does no contain a steroid | Synonyms: nonsteroidal |
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| nursemaid | (noun) a woman who is the custodian of children | Synonyms: nanny, nurse |
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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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| ootid | (noun) mature ovum after penetration by sperm but before the formation of a zygote | - |
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| orchid | (noun) any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors | Synonyms: orchidaceous plant |
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| ornithomimid | (noun) lightly built medium-sized dinosaur having extremely long limbs and necks with small heads and big brains and large eyes | - |
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| overbid | (noun) a bid that is higher than preceding bids | - |
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| (noun) (bridge) a bid that is higher than your opponent's bid (especially when your partner has not bid at all and your bid exceeds the value of your hand) | Synonyms: overcall |
| oviraptorid | (noun) advanced carnivorous theropods, characterized by their toothless, parrot-like beaks and, in several cases, elaborate crests | - |
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| ovoid | (noun) an egg-shaped object | - |
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| oxyacid | (noun) any acid that contains oxygen | Synonyms: oxygen acid |
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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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| parlormaid | (noun) a maid in a private home whose duties are to care for the parlor and the table and to answer the door | Synonyms: parlourmaid |
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| parlourmaid | (noun) a maid in a private home whose duties are to care for the parlor and the table and to answer the door | Synonyms: parlormaid |
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| pentastomid | (noun) wormlike arthropod having two pairs of hooks at the sides of the mouth; parasitic in nasal sinuses of mammals | Synonyms: tongue worm |
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| percoid | (noun) any of numerous spiny-finned fishes of the order Perciformes | Synonyms: percoid fish, percoidean |
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| phasianid | (noun) a kind of game bird in the family Phasianidae | - |
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| phasmid | (noun) large cylindrical or flattened mostly tropical insects with long strong legs that feed on plants; walking sticks and leaf insects | Synonyms: phasmid insect |
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| phoronid | (noun) hermaphrodite wormlike animal living in mud of the sea bottom | - |
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| phospholipid | (noun) any of various compounds composed of fatty acids and phosphoric acid and a nitrogenous base; an important constituent of membranes | - |
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| pierid | (noun) any of numerous pale-colored butterflies having three pairs of well-developed legs | Synonyms: pierid butterfly |
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| plaid | (noun) a cloth having a crisscross design | Synonyms: tartan |
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| planetoid | (noun) any of numerous small celestial bodies that move around the sun | Synonyms: minor planet |
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| plasmid | (noun) a small cellular inclusion consisting of a ring of DNA that is not in a chromosome but is capable of autonomous replication | Synonyms: plasmid DNA |
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| plastid | (noun) any of various small particles in the cytoplasm of the cells of plants and some animals containing pigments or starch or oil or protein | - |
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| poeciliid | (noun) small usually brightly-colored viviparous surface-feeding fishes of fresh or brackish warm waters; often used in mosquito control | Synonyms: live-bearer, poeciliid fish, topminnow |
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| polyploid | (noun) (genetics) an organism or cell having more than twice the haploid number of chromosomes | - |
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| pongid | (noun) any of the large anthropoid apes of the family Pongidae | Synonyms: great ape |
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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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| probenecid | (noun) a uricosuric drug that reduces the level of uric acid in the blood; used to treat gout | - |
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| procyonid | (noun) plantigrade carnivorous mammals | - |
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| psocid | (noun) small winged insect living on the bark and leaves of trees and feeding on e.g. fungi and decaying plant matter | - |
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| psychodid | (noun) a fly of the family Psychodidae | - |
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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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| pycnogonid | (noun) any of various small spiderlike marine arthropods having small thin bodies and long slender legs | Synonyms: sea spider |
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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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| pyramid | (noun) (stock market) a series of transactions in which the speculator increases his holdings by using the rising market value of those holdings as margin for further purchases | - |
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| (noun) a polyhedron having a polygonal base and triangular sides with a common vertex | - |
| quid | (noun) a wad of something chewable as tobacco | Synonyms: chaw, chew, cud, plug, wad |
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| (noun) something for something; that which a party receives (or is promised) in return for something he does or gives or promises | Synonyms: quid pro quo |
| (noun) the basic unit of money in Great Britain and Northern Ireland; equal to 100 pence | Synonyms: British pound, British pound sterling, pound, pound sterling |
| raid | (noun) a sudden short attack | Synonyms: foray, maraud |
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| (noun) an attempt by speculators to defraud investors | - |
| ranid | (noun) insectivorous usually semiaquatic web-footed amphibian with smooth moist skin and long hind legs | Synonyms: true frog |
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| rapid | (noun) a part of a river where the current is very fast | - |
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| reduviid | (noun) a true bug: long-legged predacious bug living mostly on other insects; a few suck blood of mammals | Synonyms: assassin bug |
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| resid | (noun) oil products that remain after petroleum has been distilled | Synonyms: residual oil |
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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 | - |
| salmonid | (noun) soft-finned fishes of cold and temperate waters | - |
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| sarcoptid | (noun) whitish mites that attack the skin of humans and other animals | Synonyms: itch mite |
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| saturniid | (noun) large brightly colored and usually tropical moth; larvae spin silken cocoons | Synonyms: saturniid moth |
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| scarabaeid | (noun) any of numerous species of stout-bodied beetles having heads with horny spikes | Synonyms: scarabaean, scarabaeid beetle |
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| schizoid | (noun) characterized by symptoms similar to but less severe than schizophrenia | Synonyms: schizotypal personality |
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| sciaenid | (noun) widely distributed family of carnivorous percoid fishes having a large air bladder used to produce sound | Synonyms: sciaenid fish |
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| sciarid | (noun) minute blackish gregarious flies destructive to mushrooms and seedlings | Synonyms: fungus gnat, sciara |
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| scincid | (noun) alert agile lizard with reduced limbs and an elongated body covered with shiny scales; more dependent on moisture than most lizards; found in tropical regions worldwide | Synonyms: scincid lizard, skink |
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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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| scorpaenid | (noun) any of numerous carnivorous usually bottom-dwelling warm-water marine fishes found worldwide but most abundant in the Pacific | Synonyms: scorpaenid fish |
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| scorpaenoid | (noun) fishes having the head armored with bony plates | Synonyms: scorpaenoid fish |
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| seid | (noun) an Old Norse term for a type of sorcery which was practiced in Norse society during the Late Scandinavian Iron Age. | Synonyms: seidh, seidhr, seidr, seith, seithr |
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| serranid | (noun) marine food sport fishes mainly of warm coastal waters | Synonyms: serranid 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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| silurid | (noun) Old World freshwater catfishes having naked skin and a long anal fin more or less merged with the eellike caudal fin | Synonyms: silurid fish |
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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 |
| 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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| skid | (noun) an unexpected slide | Synonyms: sideslip, slip |
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| (noun) one of a pair of planks used to make a track for rolling or sliding objects | - |
| (noun) a restraint provided when the brake linings are moved hydraulically against the brake drum to retard the wheel's rotation | Synonyms: brake shoe, shoe |
| solenoid | (noun) a coil of wire around an iron core; becomes a magnet when current passes through the coil | - |
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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 | - |
| sparid | (noun) spiny-finned food fishes of warm waters having well-developed teeth | Synonyms: sparid fish |
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| spermatid | (noun) an immature gamete produced by a spermatocyte; develops into a spermatozoon | - |
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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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| sphingid | (noun) any of various moths with long narrow forewings capable of powerful flight and hovering over flowers to feed | Synonyms: hawk moth, hawkmoth, hummingbird moth, sphinx moth |
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| squid | (noun) widely distributed fast-moving ten-armed cephalopod mollusk having a long tapered body with triangular tail fins | - |
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| (noun) (Italian cuisine) squid prepared as food | Synonyms: calamari, calamary |
| 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 |
| stromateid | (noun) small marine fish with a short compressed body and feeble spines | Synonyms: butterfish, stromateid fish |
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| stupid | (noun) a person who is not very bright | Synonyms: dolt, dullard, pillock, poor fish, pudden-head, pudding head, stupe, stupid person |
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| 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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| synapsid | (noun) extinct reptile having a single pair of lateral temporal openings in the skull | Synonyms: synapsid reptile |
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| tabloid | (noun) newspaper with half-size pages | Synonyms: rag, sheet |
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| (noun) sensationalist journalism | Synonyms: tab, yellow journalism |
| teiid | (noun) tropical New World lizard with a long tail and large rectangular scales on the belly and a long tail | Synonyms: teiid lizard |
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| tenebrionid | (noun) sluggish hard-bodied black terrestrial weevil whose larvae feed on e.g. decaying plant material or grain | Synonyms: darkling beetle, darkling groung beetle |
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| teredinid | (noun) wormlike marine bivalve that bores into wooden piers and ships by means of drill-like shells | Synonyms: shipworm |
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| tetranychid | (noun) web-spinning mite that attacks garden plants and fruit trees | Synonyms: spider mite |
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| tettigoniid | (noun) grasshoppers with long threadlike antennae and well-developed stridulating organs on the forewings of the male | Synonyms: long-horned grasshopper |
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| therapsid | (noun) probably warm-blooded; considered direct ancestor of mammals | Synonyms: protomammal |
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| theridiid | (noun) spider having a comb-like row of bristles on each hind foot | Synonyms: comb-footed spider |
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| thripid | (noun) any of various small to minute sucking insects with narrow feathery wings if any; they feed on plant sap and many are destructive | Synonyms: thrip, thrips |
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| thyroid | (noun) located near the base of the neck | Synonyms: thyroid gland |
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| timid | (noun) people who are fearful and cautious | Synonyms: cautious |
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| tineid | (noun) small yellowish moths whose larvae feed on wool or fur | Synonyms: tineid moth |
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