13-letter words containing o, t, s
- harry hotspur — the nickname of Sir Henry Percy
- hart's-tongue — a fern, Phyllitis scolopendrium, having long, leathery, wavy-edged leaves.
- haruspication — the use of animal entrails for divination
- harvest mouse — an Old World field mouse, Micromys minutus, that builds a spherical nest among the stems of grains and other plants.
- hash function — (programming) A hash coding function which assigns a data item distinguished by some "key" into one of a number of possible "hash buckets" in a hash table. The hash function is usually combined with another more precise function. For example a program might take a string of letters and put it in one of twenty six lists depending on its first letter. Ideally, a hash function should distribute items evenly between the buckets to reduce the number of hash collisions. If, for example, the strings were names beginning with "Mr.", "Miss" or "Mrs." then taking the first letter would be a very poor hash function because all names would hash the same.
- head of state — the person who holds the highest position in a national government: a meeting of heads of state.
- head of steam — momentum; driving power
- health resort — spa
- heart surgeon — a surgeon who specializes in performing operations on the heart
- heartstopping — Very exciting or shocking, as though to cause one's heart to skip beats.
- heliocentrism — The theory that the sun is the center of the universe, (This theory is historically important and was widely accepted at the time of Copernicus, Galileo and Kepler.).
- hematogenesis — hematopoiesis.
- hematologists — Plural form of hematologist.
- hematophagous — feeding on blood, as the vampire bat.
- hematopoiesis — the formation of blood.
- hematosalpinx — (medicine) A medical condition involving bleeding into the Fallopian tubes.
- hemichordates — Plural form of hemichordate.
- hemocytoblast — a primordial cell capable of developing into any type of blood cell.
- hepatectomies — Plural form of hepatectomy.
- here's to sth — You use expressions such as 'here's to us' and 'here's to your new job' before drinking a toast in order to wish someone success or happiness.
- heresiologist — a person who studies or writes about heresies.
- herod antipas — died after a.d. 39, ruler of Galilee, a.d. 4–39: ordered the execution of John the Baptist and participated in the trial of Jesus.
- heroic stanza — elegiac stanza.
- herpes zoster — shingles.
- herpetologist — the branch of zoology dealing with reptiles and amphibians.
- hertfordshire — a county in SE England. 631 sq. mi. (1635 sq. km).
- hertogenbosch — 's Hertogenbosch.
- hessian boots — a knee-high tasseled boot, fashionable in England in the early 19th century.
- hetero-sexism — a prejudiced attitude or discriminatory practices against homosexuals by heterosexuals.
- heteroblastic — (of a plant or plant part) showing a marked difference in form between the juvenile and the adult structures
- heterocarpous — (of a plant) producing more than one type of fruit
- heteroclitous — heteroclite
- heterocystous — containing or relating to heterocysts
- heterogametes — Plural form of heterogamete.
- heterogeneous — different in kind; unlike; incongruous.
- heterogenesis — Also, heterogeny [het-uh-roj-uh-nee] /ˌhɛt əˈrɒdʒ ə ni/ (Show IPA). alternation of generations, especially the alternation of parthenogenetic and sexual generations.
- heteroglossia — (linguistics) the coexistence of distinct varieties within a single linguistic code.
- heteroplastic — the repair of lesions with tissue from another individual or species.
- heteropterous — belonging or pertaining to the Heteroptera, in some classifications a suborder of hemipterous insects comprising the true bugs.
- heterosexuals — Plural form of heterosexual.
- heterosporous — having more than one kind of spore.
- heterostracan — any of several ostracoderms of the order Heterostraci, from the Silurian and Devonian Periods, having the anterior part of the body enclosed in bony plates.
- heterostrophy — the condition of being heterostrophic
- heterostylism — the condition of being heterostyled
- heterozygosis — the state of being a heterozygote.
- heterozygotes — a hybrid containing genes for two unlike forms of a characteristic, and therefore not breeding true to type.
- hexadactylous — hexadactylic
- hieroglyphist — a person who studies hieroglyphics; hieroglyphologist.
- hippo zarytus — ancient name of Bizerte.
- histiocytosis — (medicine) An excess of histiocytes, associated with various rare diseases.