12-letter words containing a, l, t, m
- hair implant — the insertion of synthetic fibers or human hair into the scalp to cover baldness.
- half-monthly — pertaining to a month, or to each month.
- hamartiology — the doctrine of sin in Christian theology
- hambletonian — one of a superior strain of American trotting horses descended from the stallion Hambletonian.
- headmasterly — In a manner befitting a headmaster.
- health stamp — a postage stamp with a surcharge that is used to support a health camp
- 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.
- hematoblasts — Plural form of hematoblast.
- hematocolpos — (medicine) A medical condition in which the vagina fills with menstrual blood, often caused by the combination of menstruation with an imperforate hymen.
- hematologist — the study of the nature, function, and diseases of the blood and of blood-forming organs.
- hemimetaboly — Hemimetabolism.
- hemiplankton — plankton that spend part of their life cycle in a vegetative state on the sea bottom, riverbed, etc. (opposed to holoplankton).
- hepatomegaly — an abnormal enlargement of the liver, usually associated with liver disease or heart failure.
- hermetically — so as to be airtight: hermetically sealed.
- hofmannsthal — Hugo von [hoo-goh fuh n] /ˈhu goʊ fən/ (Show IPA), 1874–1929, Austrian poet, playwright, and librettist.
- hojatoleslam — a title of respect given to an ayatollah or a middle-ranking Shiite cleric, which means literally 'proof of Islam'
- homeothermal — homoiothermal.
- homolecithal — having a fairly uniform distribution of yolk, as certain eggs or ova having relatively little yolk.
- homologation — to approve; confirm or ratify.
- horometrical — Relating to horometry.
- humble plant — sensitive plant (def 1).
- humboldt bay — an inlet of the Pacific Ocean in NW California.
- humiliations — Plural form of humiliation.
- hydrothermal — noting or pertaining to the action of hot, aqueous solutions or gases within or on the surface of the earth.
- hygrothermal — (physics) Of or pertaining to both humidity and temperature.
- hymenoplasty — (medicine) Plastic surgery affecting a woman's hymen, usually involving reconstruction to the unbroken condition ordinarily characteristic of virginity.
- hypermutable — Of or in a state in which mutation is abnormally frequent.
- hyperthermal — Also, thermic. of, relating to, or caused by heat or temperature: thermal capacity.
- hypothalamic — Of or pertaining to the hypothalamus.
- hypothalamus — a region of the brain, between the thalamus and the midbrain, that functions as the main control center for the autonomic nervous system by regulating sleep cycles, body temperature, appetite, etc., and that acts as an endocrine gland by producing hormones, including the releasing factors that control the hormonal secretions of the pituitary gland.
- illegitimacy — the state or quality of being illegitimate.
- illegitimate — born of parents who are not married to each other; born out of wedlock: an illegitimate child.
- illimitation — the state of being infinite
- illuminating — to enlighten, as with knowledge.
- illumination — an act or instance of illuminating.
- illuminative — giving light; illuminating.
- illuminators — Plural form of illuminator.
- illuminatory — Increasing informative qualities; explanatory.
- imbibitional — relating to imbibition
- immaculately — free from spot or stain; spotlessly clean: immaculate linen.
- immaterially — In an immaterial manner.
- immeadiately — Misspelling of immediately.
- immethodical — not methodical; without method or system.
- immoderately — In an immoderate manner.
- immoralistic — (somewhat, rare) Of or relating to immoralism.
- immoralities — Plural form of immorality.
- immortalised — to bestow unending fame upon; perpetuate.