18-letter words containing h, a
- branching fraction — (in branching) the proportion of the disintegrating nuclei that follow a particular branch to the total number of disintegrating nuclides
- brazilian sapphire — a blue variety of tourmaline used as a gem: not a true sapphire.
- breach of contract — the act of breaking the conditions of a contract
- breach of security — an act that violates a country, area, or building's security measures
- break the internet — to cause a large number of people to attempt to access the internet
- breast enhancement — a surgical procedure to increase the size of a woman's breasts
- breathe one's last — When someone breathes their last, they die.
- breathing exercise — an exercise intended to promote effective and healthy breathing and breath control
- british somaliland — a former British protectorate (1884–1960) in E Africa, on the Gulf of Aden: united with Italian Somaliland in 1960 to form Somalia (or the Somali Republic); in 1991 the self-styled republic of Somaliland, covering the same area as the former British Somaliland, declared itself independent and continues to function largely as a separate entity, though without international recognition
- broadcasting house — any of a number of buildings in the UK from which the BBC broadcasts or has broadcast
- bromochloromethane — chlorobromomethane.
- bronchocandidiasis — See under candidiasis.
- brothers karamazov — a novel (1880) by Dostoevsky.
- burkitt's lymphoma — a cancer characterized by tumors containing lymphoid cells, occurring esp. in children, in the jaw, eyes, and internal organs: it is associated with the Epstein-Barr virus
- burst at the seams — to break, break open, or fly apart with sudden violence: The bitter cold caused the pipes to burst.
- butterhead lettuce — a major group of lettuce varieties having soft, pliable leaves and small, loose heads, including bibb and Boston lettuce
- california fuchsia — a North American onagraceous plant, Zauschneria californica, with tubular scarlet flowers
- california-fuchsia — a plant belonging to the genus Fuchsia, of the evening primrose family, including many varieties cultivated for their handsome drooping flowers.
- call to the colors — call or order to serve in the armed forces
- camel's-hair brush — an artist's small brush, made of hair from a squirrel's tail
- camembert (cheese) — a soft, rich, creamy partly ripened cheese
- capital punishment — Capital punishment is punishment which involves the legal killing of a person who has committed a serious crime such as murder.
- carbonic anhydrase — an enzyme in blood cells that catalyses the decomposition of carbonic acid into carbon dioxide and water, facilitating the transport of carbon dioxide from the tissues to the lungs
- carbonic-anhydride — carbon dioxide.
- carboxyhaemoglobin — haemoglobin coordinated with carbon monoxide, formed as a result of carbon monoxide poisoning. As carbon monoxide is bound in preference to oxygen, tissues are deprived of oxygen
- carolina chickadee — a chickadee, Parus carolinensis, of the southeastern U.S., resembling but smaller than the black-capped chickadee.
- carpenterworm moth — any moth of the family Cossidae, as Prionoxystus robiniae of the U.S. and southern Canada, whose larvae bore into the trunks and branches of oaks, locusts, and other trees.
- carthaginian peace — the treaty by which Rome reduced Carthage to the status of a puppet state in 201 b.c.
- cartilaginous fish — any fish of the class Chondrichthyes, including the sharks, skates, and rays, having a skeleton composed entirely of cartilage
- cash-for-questions — of, involved in, or relating to a scandal in which some MPs were accused of accepting bribes to ask particular questions in Parliament
- cassiopeia's chair — the five brightest stars in the constellation Cassiopeia that seem to form the shape of a W or M
- catapult launching — the fact of launching aircraft into the air by a device installed in warships
- catastrophe theory — a mathematical theory that classifies surfaces according to their form
- catch as catch can — Also, catch-can. taking advantage of any opportunity; using any method that can be applied: a catch-as-catch-can life, as an itinerant handyman.
- catch one's breath — When you catch your breath while you are doing something energetic, you stop for a short time so that you can start breathing normally again.
- catch-as-catch-can — a style of wrestling in which trips, holds below the waist, etc, are allowed
- catcher in the rye — a novel (1951) by J. D. Salinger.
- caterpillar hunter — any of various carabid beetles of the genus Calosoma, of Europe and North America, which prey on the larvae of moths and butterflies
- catherine of siena — Saint. 1347–80, Italian mystic and ascetic; patron saint of the Dominican order. Feast day: April 29
- cathode dark space — Crookes dark space.
- cauliflower cheese — a dish of cauliflower with a cheese sauce, eaten hot
- cellular telephone — a mobile phone
- centralized school — a public school formed from the pupils and teachers of a number of discontinued smaller schools, especially in a rural district.
- centrifugal clutch — an automatic clutch in which the friction surfaces are engaged by weighted levers acting under centrifugal force at a certain speed of rotation
- cepheid (variable) — any of a class of pulsating, yellow, supergiant stars whose brightness varies in regular periods: from the period-luminosity relation, the distance of such a star can be determined
- chagos archipelago — group of islands in the Indian Ocean 1,180 mi (1,899 km) northeast of Mauritius, comprising the British Indian Ocean Territory: chief island, Diego Garcia
- chamber of horrors — a room, for example in a waxworks, containing objects, images or representations of people or scenes that are believed likely to frighten or horrify visitors
- chambered nautilus — nautilus (def 1).
- championship point — a point that would decide the winner of a match that would decide the championship
- chandelier earring — one of a pair of long and ornate earrings that dangle from the earlobes, usually dropping from more than one level.