12-letter words containing t, h, a, c
- harvest tick — chigger (def 1).
- hatchability — to bring forth (young) from the egg.
- hatchet face — a thin face with sharp features.
- hatchet-face — a face with narrow dimensions and sharp features
- head lettuce — any variety of the lettuce subspecies Lactuca sativa capitata, having leaves that grow in a dense rosette, especially iceberg lettuce and Boston lettuce.
- head teacher — A head teacher is a teacher who is in charge of a school.
- health check — a medical checkup
- health scare — a state of alarm caused by a revelation concerning public heath
- heart attack — damage to an area of heart muscle that is deprived of oxygen, usually due to blockage of a diseased coronary artery, typically accompanied by chest pain radiating down one or both arms, the severity of the attack varying with the extent and location of the damage; myocardial infarction.
- heart cherry — a large, heart-shaped variety of sweet cherry having soft flesh.
- heart urchin — an echinoderm of the order Spatangoida, having an elongate, somewhat heart-shaped outer covering.
- helicobacter — Any member of the Helicobacter bacteria.
- hello packet — (networking, communications) An OSPF packet sent periodically on each network interface, real or virtual, to discover and test connections to neighbours. Hello packets are multicast on physical networks capable of multicasting or broadcasting to enable dynamic router discovery. They include the parameters that routers connected to a common network must agree on. Hello packets increase network resilience by, e.g., allowing a router to establish a secondary connection when a primary connection fails.
- hematochezia — the passage of bloody stools.
- hematocolpos — (medicine) A medical condition in which the vagina fills with menstrual blood, often caused by the combination of menstruation with an imperforate hymen.
- hemichordate — belonging or pertaining to the chordates of the phylum Hemichordata, comprising small, widely distributed, marine animals, as the acorn worms.
- hepaticology — the scientific study of bryophyte plants known as hepatics or liverworts
- hepatoxicity — Toxicity that affects the liver.
- hermetically — so as to be airtight: hermetically sealed.
- heterocercal — having an unequally divided tail, characteristic of sharks, rays, and skates.
- heterodactyl — having the first and fourth toes directed backward, and the second and third forward, as in trogons.
- heterosocial — relating to or denoting mixed-sex social relationships
- heterotactic — of, relating to, or characterized by heterotaxis.
- hever castle — a Tudor mansion near Edenbridge in Kent: home of Anne Boleyn before her marriage; Italian garden added in the 20th century by the Astor family
- hexadactylic — having six fingers or toes
- hidrocystoma — An adenoma of the sweat glands.
- hierarchists — hierarchical principles, rule, or influence.
- hieratically — In a hieratic way.
- hierophantic — (in ancient Greece) an official expounder of rites of worship and sacrifice.
- hippocentaur — Centaur.
- hippopotamic — like, of, or relating to a hippopotamus
- histiocytoma — A tumour consisting of histiocytes.
- histographic — a treatise on or description of organic tissues.
- histological — the branch of biology dealing with the study of tissues.
- historically — of, pertaining to, treating, or characteristic of history or past events: historical records; historical research.
- histrionical — (British) Alternative form of histrionic.
- hit the sack — a large bag of strong, coarsely woven material, as for grain, potatoes, or coal.
- hitachi 6309 — (processor) (HD6309) Hitachi's version of the Motorola 6809 microprocessor. Compatible with the 6809, it added two new eight-bit registers that could be added to form a second 16-bit register, and all four eight-bit registers could form a 32-bit register. It also featured division, and some 32-bit arithmetic and was generally 30% faster in native mode. This information, surprisingly, was never published by Hitachi.
- hitch a ride — hitchhike
- hockey skate — a tubular ice skate having a shorter blade than a racing skate and often having a reinforced shoe for protection.
- holistically — incorporating the concept of holism, or the idea that the whole is more than merely the sum of its parts, in theory or practice: holistic psychology.
- holophrastic — using or consisting of a single word that functions as a phrase or sentence.
- home teacher — private tutor
- homoeopathic — Alternative spelling of homeopathic.
- homolecithal — having a fairly uniform distribution of yolk, as certain eggs or ova having relatively little yolk.
- homoromantic — Romantically attracted to those of the same gender.
- horometrical — Relating to horometry.
- hovering act — an act forbidding or restricting the loitering of foreign or domestic vessels within the prescribed limits of a coastal nation.
- humification — the formation of humus.
- hunting case — a watchcase with a hinged cover to protect the crystal.