| gallium | (noun) a rare silvery (usually trivalent) metallic element; brittle at low temperatures but liquid above room temperature; occurs in trace amounts in bauxite and zinc ores | Synonyms: atomic number 31, Ga |
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| gametangium | (noun) cell or organ in which gametes develop | - |
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| gametoecium | (noun) gametangia and surrounding bracts | - |
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| gastrolobium | (noun) any of various Australian evergreen shrubs of the genus Gastrolobium having whorled compound leaves poisonous to livestock and showy yellow to deep reddish-orange flowers followed by two-seeded pods | Synonyms: poison bush, poison pea |
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| geranium | (noun) any of numerous plants of the family Geraniaceae | - |
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| germanium | (noun) a brittle grey crystalline element that is a semiconducting metalloid (resembling silicon) used in transistors; occurs in germanite and argyrodite | Synonyms: atomic number 32, Ge |
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| glochidium | (noun) a barbed spine or bristle (often tufted on cacti) | Synonyms: glochid |
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| glucinium | (noun) a light strong brittle grey toxic bivalent metallic element | Synonyms: atomic number 4, Be, beryllium |
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| glum | (adjective) moody and melancholic | - |
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| (adjective) showing a brooding ill humor | Synonyms: dark, dour, glowering, moody, morose, saturnine, sour, sullen |
| gnetum | (noun) small tropical tree with tiered branches and divaricate branchlets having broad glossy dark green leaves; exploited for its edible young leaves and seeds that provide a fine flour | Synonyms: Gnetum gnemon |
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| guaiacum | (noun) hard greenish-brown wood of the lignum vitae tree and other trees of the genus Guaiacum | Synonyms: guaiac, lignum vitae |
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| (noun) medicinal resin from the lignum vitae tree | - |
| gum | (noun) the tissue (covered by mucous membrane) of the jaws that surrounds the bases of the teeth | Synonyms: gingiva |
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| (noun) a preparation (usually made of sweetened chicle) for chewing | Synonyms: chewing gum |
| (noun) any of various trees of the genera Eucalyptus or Liquidambar or Nyssa that are sources of gum | Synonyms: gum tree |
| (noun) wood or lumber from any of various gum trees especially the sweet gum | Synonyms: gumwood |
| (noun) any of various substances (soluble in water) that exude from certain plants; they are gelatinous when moist but harden on drying | - |
| (noun) cement consisting of a sticky substance that is used as an adhesive | Synonyms: glue, mucilage |
| (verb) exude or form gum | - |
| (verb) become sticky | - |
| (verb) grind with the gums; chew without teeth and with great difficulty | Synonyms: mumble |
| (verb) cover, fill, fix or smear with or as if with gum | - |
| gymnasium | (noun) athletic facility equipped for sports or physical training | Synonyms: gym |
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| gynoecium | (noun) a female gametoecium | - |
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| gynostegium | (noun) the crown of the stamen in plants of the genus Asclepias | - |
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| gypsum | (noun) a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris) | - |
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| hafnium | (noun) a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons | Synonyms: atomic number 72, Hf |
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| hahnium | (noun) a transuranic element with atomic number 105 | Synonyms: atomic number 105, Db, dubnium, element 105 |
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| halobacterium | (noun) halophiles in saline environments such as the Dead Sea or salt flats | Synonyms: halobacter, halobacteria |
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| harmonium | (noun) a free-reeded instrument with a piano keyboard in which air is forced through the reeds by bellows | Synonyms: organ, reed organ |
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| hassium | (noun) a radioactive transuranic element, with atomic number 108 | Synonyms: atomic number 108, element 108, Hs |
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| haustorium | (noun) a root-like attachment in parasitic plants that penetrates and obtains food from the host | - |
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| helianthemum | (noun) any plant of the genus Helianthemum; vigorous plants of stony alpine meadows and dry scrub regions | Synonyms: sun rose, sunrose |
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| helium | (noun) a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas) | Synonyms: atomic number 2, He |
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| herbarium | (noun) a collection of dried plants that are mounted and systematically classified for study | - |
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| hilum | (noun) (anatomy) a depression or fissure where vessels or nerves or ducts enter a bodily organ | Synonyms: hilus |
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| (noun) the scar on certain seeds marking its point of attachment to the funicle | - |
| hippeastrum | (noun) amaryllis of tropical America often cultivated as a houseplant for its showy white to red flowers | Synonyms: Hippeastrum puniceum |
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| hokum | (noun) a message that seems to convey no meaning | Synonyms: bunk, meaninglessness, nonsense, nonsensicality |
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| holmium | (noun) a trivalent metallic element of the rare earth group; occurs together with yttrium; forms highly magnetic compounds | Synonyms: atomic number 67, Ho |
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| honorarium | (noun) a fee paid for a nominally free service | - |
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| hoodlum | (noun) an aggressive and violent young criminal | Synonyms: goon, hood, punk, strong-armer, thug, tough, toughie |
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| hordeolum | (noun) an infection of the sebaceous gland of the eyelid | Synonyms: eye infection, sty, stye |
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| hum | (noun) a humming noise | Synonyms: humming |
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| (noun) the state of being or appearing to be actively engaged in an activity | Synonyms: busyness |
| (verb) sing with closed lips | - |
| (verb) make a low continuous sound | - |
| (verb) sound with a monotonous hum | Synonyms: thrum |
| (verb) be noisy with activity | Synonyms: buzz, seethe |
| humdrum | (adjective) tediously repetitious or lacking in variety | Synonyms: monotonous |
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| (adjective) not challenging; dull and lacking excitement | Synonyms: commonplace, prosaic, unglamorous, unglamourous |
| (noun) the quality of wearisome constancy, routine, and lack of variety | Synonyms: monotony, sameness |
| hydrargyrum | (noun) a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures | Synonyms: atomic number 80, Hg, mercury, quicksilver |
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| hymenium | (noun) spore-bearing layer of cells in certain fungi containing asci or basidia | - |
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| hypanthium | (noun) the cuplike or ringlike or tubular structure of a flower which bears the sepals and stamens and calyx (as in Rosaceae) | Synonyms: calyx tube, floral cup |
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| hypobasidium | (noun) special cell constituting the base of the basidium in various fungi especially of the order Tremellales | - |
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| hypochondrium | (noun) the upper region of the abdomen just below the lowest ribs on either side of the epigastrium | - |
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| ileum | (noun) the part of the small intestine between the jejunum and the cecum | - |
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| ilium | (noun) the upper and widest of the three bones making up the hipbone | - |
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| imaum | (noun) (Islam) the man who leads prayers in a mosque; for Shiites an imam is a recognized authority on Islamic theology and law and a spiritual guide | Synonyms: imam |
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| imperium | (noun) supreme authority; absolute dominion | - |
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| (noun) the domain ruled by an emperor or empress; the region over which imperial dominion is exercised | Synonyms: empire |
| indecorum | (noun) an act of undue intimacy | Synonyms: familiarity, impropriety, liberty |
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| (noun) a lack of decorum | Synonyms: indecorousness |
| indium | (noun) a rare soft silvery metallic element; occurs in small quantities in sphalerite | Synonyms: atomic number 49, In |
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| indumentum | (noun) a covering of fine hairs (or sometimes scales) as on a leaf or insect | Synonyms: indument |
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| indusium | (noun) a membrane enclosing and protecting the developing spores especially that covering the sori of a fern | - |
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| infundibulum | (noun) any of various funnel-shaped parts of the body (but especially the hypophyseal stalk) | - |
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| inoculum | (noun) a substance (a virus or toxin or immune serum) that is introduced into the body to produce or increase immunity to a particular disease | Synonyms: inoculant |
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| interregnum | (noun) the time between two reigns, governments, etc. | - |
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| iridium | (noun) a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium | Synonyms: atomic number 77, Ir |
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| ischium | (noun) one of the three sections of the hipbone; situated below the ilium | Synonyms: ischial bone, os ischii |
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| jejunum | (noun) the part of the small intestine between the duodenum and the ileum | - |
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| jorum | (noun) a large drinking bowl | - |
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| (noun) the quantity that a jorum will hold. | - |
| kettledrum | (noun) a large hemispherical brass or copper percussion instrument with a drumhead that can be tuned by adjusting the tension on it | Synonyms: kettle, timpani, tympani, tympanum |
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| khoum | (noun) 5 khoums equal 1 ouguiya in Mauritania | - |
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| labdanum | (noun) a soft blackish-brown resinous exudate from various rockroses used in perfumes especially as a fixative | Synonyms: ladanum |
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| (noun) a dark brown to greenish oleoresin that has a fragrant odor and is used as a fixative in perfumes; obtained as a juice from certain rockroses | Synonyms: gum labdanum |
| labium | (noun) a liplike structure that bounds a bodily orifice (especially any of the four labiate folds of a woman's vulva) | - |
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| ladanum | (noun) a soft blackish-brown resinous exudate from various rockroses used in perfumes especially as a fixative | Synonyms: labdanum |
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| lanthanum | (noun) a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth | Synonyms: atomic number 57, La |
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| laudanum | (noun) narcotic consisting of an alcohol solution of opium or any preparation in which opium is the main ingredient | Synonyms: tincture of opium |
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| lawrencium | (noun) a radioactive transuranic element synthesized from californium | Synonyms: atomic number 103, Lr |
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| lebensraum | (noun) space sought for occupation by a nation whose population is expanding | Synonyms: living space |
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| leptosporangium | (noun) a sporangium formed from a single epidermal cell; characteristic of the Filicales or of almost all modern ferns | - |
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| lignum | (noun) woody tissue | - |
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| linoleum | (noun) a floor covering | Synonyms: lino |
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| lithium | (noun) a soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals | Synonyms: atomic number 3, Li |
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| locum | (noun) someone (physician or clergyman) who substitutes temporarily for another member of the same profession | Synonyms: locum tenens |
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| lustrum | (noun) a ceremonial purification of the Roman population every five years following the census | - |
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| (noun) a period lasting five years | - |
| lutecium | (noun) a trivalent metallic element of the rare earth group; usually occurs in association with yttrium | Synonyms: atomic number 71, Lu, lutetium |
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| lutetium | (noun) a trivalent metallic element of the rare earth group; usually occurs in association with yttrium | Synonyms: atomic number 71, Lu, lutecium |
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| lyceum | (noun) a public hall for lectures and concerts | - |
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| (noun) a school for students intermediate between elementary school and college; usually grades 9 to 12 | Synonyms: Gymnasium, lycee, middle school, secondary school |
| macrosporangium | (noun) a plant structure that produces megaspores | Synonyms: megasporangium |
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| magnesium | (noun) a light silver-white ductile bivalent metallic element; in pure form it burns with brilliant white flame; occurs naturally only in combination (as in magnesite and dolomite and carnallite and spinel and olivine) | Synonyms: atomic number 12, Mg |
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| magnum | (noun) a large wine bottle for liquor or wine | - |
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| manubrium | (noun) the upper part of the breastbone | - |
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| marsupium | (noun) an external abdominal pouch in most marsupials where newborn offspring are suckled | - |
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| marum | (noun) Mediterranean germander having small hairy leaves and reddish purple flowers; attractive to cats | Synonyms: cat thyme, Teucrium marum |
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| mausoleum | (noun) a large burial chamber, usually above ground | - |
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| maximum | (adjective) the greatest or most complete or best possible | Synonyms: maximal |
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| (noun) the greatest possible degree | Synonyms: level best, utmost, uttermost |
| (noun) the point on a curve where the tangent changes from positive on the left to negative on the right | - |
| (noun) the largest possible quantity | Synonyms: upper limit |
| meconium | (noun) thick dark green mucoid material that is the first feces of a newborn child | - |
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| mediastinum | (noun) the part of the thoracic cavity between the lungs that contains the heart and aorta and esophagus and trachea and thymus | - |
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| medium | (adjective) (meat) cooked until there is just a little pink meat inside | - |
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| (adjective) around the middle of a scale of evaluation | Synonyms: average, intermediate |
| (noun) an occupation for which you are especially well suited | Synonyms: metier |
| (noun) an intervening substance through which signals can travel as a means for communication | - |
| (noun) a means or instrumentality for storing or communicating information | - |
| (noun) (usually plural) transmissions that are disseminated widely to the public | Synonyms: mass medium |
| (noun) the surrounding environment | - |
| (noun) someone who serves as an intermediary between the living and the dead | Synonyms: sensitive, spiritualist |
| (noun) a state that is intermediate between extremes; a middle position | - |
| (noun) (bacteriology) a nutrient substance (solid or liquid) that is used to cultivate micro-organisms | Synonyms: culture medium |
| (noun) (biology) a substance in which specimens are preserved or displayed | - |
| (noun) a liquid with which pigment is mixed by a painter | - |
| (noun) an intervening substance through which something is achieved | - |
| meerschaum | (noun) a pipe having a bowl made of meerschaum | - |
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| (noun) a white clayey mineral | Synonyms: sepiolite |
| megasporangium | (noun) a plant structure that produces megaspores | Synonyms: macrosporangium |
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| meitnerium | (noun) a radioactive transuranic element, with atomic number 109 | Synonyms: atomic number 109, element 109, Mt |
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| memorandum | (noun) a written proposal or reminder | Synonyms: memo, memoranda |
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| mendelevium | (noun) a radioactive transuranic element synthesized by bombarding einsteinium with alpha particles (Md is the current symbol for mendelevium but Mv was formerly the symbol) | Synonyms: atomic number 101, Md, Mv |
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| menstruum | (noun) the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause | Synonyms: catamenia, flow, menses, menstruation, period |
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| (noun) (archaic) a solvent | - |
| mentum | (noun) a projection below the mouth of certain mollusks that resembles a chin | - |
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| (noun) the protruding part of the lower jaw | Synonyms: chin |
| (noun) a projection like a chin formed by the sepals and base of the column in some orchids | - |
| mesothelium | (noun) epithelium originating in the embryonic mesoderm; lines the primordial body cavity | - |
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| mezereum | (noun) the dried bark of the shrub mezereon | - |
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| microsporangium | (noun) a plant structure that produces microspores | - |
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| milium | (noun) a small whitish lump in the skin due to a clogged sebaceous gland | Synonyms: whitehead |
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| millennium | (noun) a span of 1000 years | Synonyms: millenary |
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| (noun) (New Testament) in the Book of Revelation it is foretold that those faithful to Jesus will reign with Jesus over the earth for a thousand years; the meaning of these words have been much debated; some denominations (e.g. Jehovah's Witnesses) expect it to be a thousand years of justice and peace and happiness | - |
| (noun) the 1000th anniversary (or the celebration of it) | Synonyms: millenary |
| minimum | (adjective) the least possible | Synonyms: minimal |
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| (noun) the point on a curve where the tangent changes from negative on the left to positive on the right | - |
| (noun) the smallest possible quantity | Synonyms: lower limit |
| minium | (noun) a reddish oxide of lead (Pb3O4) used as a pigment in paints and in glass and ceramics | Synonyms: red lead |
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| modicum | (noun) a small or moderate or token amount | - |
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| molluscum | (noun) any skin disease characterized by soft pulpy nodules | - |
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| molybdenum | (noun) a polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel | Synonyms: atomic number 42, Mo |
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