12-letter words containing a, i, m, t
- geometrician — a person skilled in geometry.
- german sixth — (in musical harmony) an augmented sixth chord having a major third and a perfect fifth between the root and the augmented sixth
- germinations — Plural form of germination.
- giant fulmar — either of two large white or brownish petrels of the genus Macronectes, of the Antarctic Ocean and adjacent seas.
- giant slalom — a slalom race in which the course has more gates and is longer and steeper than that in a regular slalom.
- gigantomachy — (in Greek mythology) the struggle between the gods and the giants.
- gila monster — a large, venomous lizard, Heloderma suspectum, of the southwestern U.S. and northwestern Mexico, covered with beadlike scales of yellow, orange, and black.
- glioblastoma — A highly invasive glioma in the brain.
- glossematics — a school of linguistic analysis developed by Louis Hjelmslev (1899–1965) in Copenhagen in the 1930s based on the study of the distribution of glossemes.
- gothic armor — white armor of the 15th century, marked especially by much fluting and ornamentation.
- grammaticise — to make grammatical
- grammaticism — a point or principle of grammar.
- grammaticize — (transitive) To render grammatical.
- gramophonist — a person who uses a gramophone
- gran turismo — (of an automobile) certified as conforming to the specifications, as fuel capacity and engine displacement, for a class of standard automobiles (Gran Turismo) qualified to engage in various types of competitions. Abbreviation: GTO.
- granny smith — a variety of crisp, green-skinned apple, for eating raw or for cooking.
- gravitometer — an instrument that measures specific gravities
- gravitropism — (biology, botany) a plant's ability to change its growth in response to gravity.
- great primer — an 18-point type of a size larger than Columbian, formerly used for Bibles.
- great schism — a period of division in the Roman Catholic Church, 1378–1417, over papal succession, during which there were two, or sometimes three, claimants to the papal office.
- guesstimated — Simple past tense and past participle of guesstimate.
- guesstimates — Plural form of guesstimate.
- gynecomastia — abnormal enlargement of the breast in a male.
- gyromagnetic — of or relating to the magnetic properties of a rotating charged particle.
- habilimented — Clothed.
- haematemesis — Alternative spelling of hematemesis.
- haematolysis — Haemolysis.
- haematoxylin — Alternative spelling of hematoxylin.
- haemoprotein — Alternative spelling of hemoprotein.
- hair implant — the insertion of synthetic fibers or human hair into the scalp to cover baldness.
- hamarthritis — a swollen and painful condition that can affect all the joints
- hamartiology — the doctrine of sin in Christian theology
- hambletonian — one of a superior strain of American trotting horses descended from the stallion Hambletonian.
- hamstringing — Present participle of hamstring.
- harmoniumist — a person who plays a harmonium
- harvest mite — chigger (def 1).
- harvest time — season when crops are gathered
- have it made — simple past tense and past participle of make1 .
- headmistress — a woman in charge of a private school.
- heartwarming — gratifying; rewarding; satisfying: a heartwarming response to his work.
- heath family — the plant family Ericaceae, characterized by evergreen or deciduous shrubs, trees, and woody plants growing in acid soil and having simple leaves, often showy flowers either solitary or in clusters, and fruit in the form of a berry or capsule, and including the azalea, blueberry, cranberry, heather, madrone, mountain laurel, rhododendron, and trailing arbutus.
- helianthemum — (botany) Any of the genus Helianthemum of rockroses.
- hellgramites — Plural form of hellgramite.
- hellgrammite — the aquatic larva of a dobsonfly, used as bait in fishing.
- hemangiomata — See under angioma.
- hemarthrosis — (pathology) bleeding in the joints.
- hematochezia — the passage of bloody stools.
- hematologist — the study of the nature, function, and diseases of the blood and of blood-forming organs.
- hematophobia — Fear of bleeding or the sight of blood.
- hemichordate — belonging or pertaining to the chordates of the phylum Hemichordata, comprising small, widely distributed, marine animals, as the acorn worms.