| demantoid | (noun) a green andradite used as a gemstone | - |
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| desmid | (noun) freshwater green algae | - |
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| diapsid | (noun) reptile having a pair of openings in the skull behind each eye | Synonyms: diapsid reptile |
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| dicamptodontid | (noun) salamanders found near cold streams throughout the year | Synonyms: dicamptodon |
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| dihybrid | (noun) a hybrid produced by parents that differ only at two gene loci that have two alleles each | - |
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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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| elapid | (noun) any of numerous venomous fanged snakes of warmer parts of both hemispheres | Synonyms: elapid snake |
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| elaterid | (noun) any of various widely distributed beetles | Synonyms: elater, elaterid beetle |
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| ellipsoid | (noun) a surface whose plane sections are all ellipses or circles | - |
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| energid | (noun) a biological unit consisting of a nucleus and the body of cytoplasm with which it interacts | Synonyms: protoplast |
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| ephemerid | (noun) short-lived insect | Synonyms: ephemeropteran |
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| epicycloid | (noun) a line generated by a point on a circle rolling around another circle | - |
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| equid | (noun) hoofed mammals having slender legs and a flat coat with a narrow mane along the back of the neck | Synonyms: equine |
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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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| euglenid | (noun) marine and freshwater green or colorless flagellate organism | Synonyms: euglenoid, euglenophyte |
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| euglenoid | (noun) marine and freshwater green or colorless flagellate organism | Synonyms: euglenid, euglenophyte |
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| eurypterid | (noun) large extinct scorpion-like arthropod considered related to horseshoe crabs | - |
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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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| 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 | - |
| felid | (noun) any of various lithe-bodied roundheaded fissiped mammals, many with retractile claws | Synonyms: feline |
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| 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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| fluid | (noun) continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas | - |
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| (noun) a substance that is fluid at room temperature and pressure | - |
| 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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| gelechiid | (noun) small slender-winged moths whose larvae are agricultural pests | Synonyms: gelechiid moth |
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| gempylid | (noun) snake mackerels; elongated marine fishes with oily flesh; resembles mackerels; found worldwide | - |
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| geometrid | (noun) slender-bodied broad-winged moth whose larvae are called measuring worms | Synonyms: geometrid moth |
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| glochid | (noun) a barbed spine or bristle (often tufted on cacti) | Synonyms: glochidium |
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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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| gracilariid | (noun) small dull or metallic-colored tineoid moths whose larvae mine in plant leaves | Synonyms: gracilariid moth |
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| grid | (noun) a cooking utensil of parallel metal bars; used to grill fish or meat | Synonyms: gridiron |
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| (noun) an electrode placed between the cathode and anode of a vacuum tube to control the flow of electrons through the tube | Synonyms: control grid |
| (noun) a system of high tension cables by which electrical power is distributed throughout a region | Synonyms: power grid, power system |
| (noun) a perforated or corrugated metal plate used in a storage battery as a conductor and support for the active material | Synonyms: storage-battery grid |
| (noun) a pattern of regularly spaced horizontal and vertical lines | - |
| haemoproteid | (noun) related to malaria parasite and having a phase in the viscera of various birds | - |
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| haemorrhoid | (noun) venous swelling external or internal to the anal sphincter | Synonyms: hemorrhoid, piles |
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| handmaid | (noun) a personal maid or female attendant | Synonyms: handmaiden |
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| (noun) in a subordinate position | Synonyms: handmaiden, servant |
| haploid | (noun) (genetics) an organism or cell having only one complete set of chromosomes | - |
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| hemerobiid | (noun) small dark-colored lacewing fly | Synonyms: brown lacewing, hemerobiid fly |
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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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| hippoboscid | (noun) bloodsucking dipterous fly parasitic on birds and mammals | Synonyms: louse fly |
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| hominid | (noun) a primate of the family Hominidae | - |
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| hominoid | (noun) a primate of the superfamily Hominoidea | - |
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| housemaid | (noun) a female domestic | Synonyms: amah, maid, maidservant |
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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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| hybrid | (noun) (genetics) an organism that is the offspring of genetically dissimilar parents or stock; especially offspring produced by breeding plants or animals of different varieties or breeds or species | Synonyms: cross, crossbreed |
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| (noun) a car which runs on two power sources, usually an internal combustion engine and an electronic motor | Synonyms: hybrid car |
| (noun) a composite of mixed origin | - |
| (noun) a word that is composed of parts from different languages (e.g., `monolingual' has a Greek prefix and a Latin root) | Synonyms: loan-blend, loanblend |
| hydatid | (noun) cyst filled with liquid; forms as a result of infestation by tapeworm larvae (as in echinococcosis) | - |
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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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| id | (noun) (psychoanalysis) primitive instincts and energies underlying all psychic activity | - |
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| iguanid | (noun) lizards of the New World and Madagascar and some Pacific islands; typically having a long tail and bright throat patch in males | Synonyms: iguanid lizard |
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| invalid | (noun) someone who is incapacitated by a chronic illness or injury | Synonyms: shut-in |
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| isocarboxazid | (noun) a monoamine oxidase inhibitor (trade name Marplan) that is used to treat clinical depression | Synonyms: Marplan |
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| isoniazid | (noun) antibacterial drug (trade name Nydrazid) used to treat tuberculosis | Synonyms: INH, Nydrazid |
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| ixodid | (noun) ticks having a hard shield on the back and mouth parts that project from the head | Synonyms: hard tick |
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| jassid | (noun) a variety of leafhopper | - |
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| katydid | (noun) large green long-horned grasshopper of North America; males produce shrill sounds by rubbing together special organs on the forewings | - |
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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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| kid | (noun) young goat | - |
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| (noun) a young person of either sex | Synonyms: child, fry, minor, nestling, nipper, shaver, small fry, tiddler, tike, tyke, youngster |
| (noun) a human offspring (son or daughter) of any age | Synonyms: child |
| (noun) soft smooth leather from the hide of a young goat | Synonyms: kidskin |
| lacertid | (noun) Old World terrestrial lizard | Synonyms: lacertid lizard |
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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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| larid | (noun) long-winged web-footed aquatic bird of the gull family | - |
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| lasiocampid | (noun) medium-sized stout-bodied neutral-colored moths with comb-like antennae | Synonyms: lasiocampid moth |
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| leporid | (noun) rabbits and hares | Synonyms: leporid mammal |
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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 |
| liliopsid | (noun) a monocotyledonous flowering plant; the stem grows by deposits on its inside | Synonyms: endogen, monocot, monocotyledon |
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| lipid | (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: lipide, lipoid |
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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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| liquid | (noun) a frictionless continuant that is not a nasal consonant (especially `l' and `r') | - |
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| (noun) the state in which a substance exhibits a characteristic readiness to flow with little or no tendency to disperse and relatively high incompressibility | Synonyms: liquid state, liquidity, liquidness |
| (noun) fluid matter having no fixed shape but a fixed volume | - |
| (noun) a substance that is liquid at room temperature and pressure | - |
| lycaenid | (noun) any of various butterflies of the family Lycaenidae | Synonyms: lycaenid butterfly |
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| lygaeid | (noun) a true bug: usually bright-colored; pest of cultivated crops and some fruit trees | Synonyms: lygaeid bug |
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| lymantriid | (noun) dull-colored moth whose larvae have tufts of hair on the body and feed on the leaves of many deciduous trees | Synonyms: tussock moth |
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| 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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| magnoliopsid | (noun) flowering plant with two cotyledons; the stem grows by deposit on its outside | Synonyms: dicot, dicotyledon, exogen |
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| maid | (noun) an unmarried girl (especially a virgin) | Synonyms: maiden |
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| (noun) a female domestic | Synonyms: amah, housemaid, maidservant |
| mantid | (noun) predacious long-bodied large-eyed insect of warm regions; rests with forelimbs raised as in prayer | Synonyms: mantis |
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| mantispid | (noun) insect that resembles a mantis; larvae are parasites in the nests of spiders and wasps | - |
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| masjid | (noun) (Islam) a Muslim place of worship | Synonyms: musjid |
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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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| megatheriid | (noun) a large extinct ground sloth | Synonyms: megatherian, megatherian mammal |
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| meloid | (noun) beetle that produces a secretion that blisters the skin | Synonyms: blister beetle |
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| mermaid | (noun) half woman and half fish; lives in the sea | - |
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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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| milkmaid | (noun) a woman who works in a dairy | Synonyms: dairymaid |
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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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| mirid | (noun) a variety of leaf bug | Synonyms: capsid, mirid bug |
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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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| monohybrid | (noun) a hybrid produced by crossing parents that are homozygous except for a single gene locus that has two alleles (as in Mendel's experiments with garden peas) | - |
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| mucoid | (noun) any of several glycoproteins similar to mucin | - |
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| mujahid | (noun) a Muslim engaged in what he considers to be a jihad | - |
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| musjid | (noun) (Islam) a Muslim place of worship | Synonyms: masjid |
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