12-letter words containing h, a, l, k
- health check — a medical checkup
- health drink — a drink that claims to be beneficial to health
- heeling tank — either of two lateral ballast tanks permitting an icebreaker to heel and crush ice to either side.
- heimskringla — a book of the 13th century narrating the history of the kings of Norway by Snorri Sturluson.
- helical rack — a rack having teeth set at an oblique angle to the edges. Compare rack1 (def 5).
- 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.
- hemiplankton — plankton that spend part of their life cycle in a vegetative state on the sea bottom, riverbed, etc. (opposed to holoplankton).
- hiking trail — a specially designated route for hikers to use
- hill walking — the activity of walking through hilly country for pleasure
- holding tank — a tank for the temporary storage of a substance.
- holidaymaker — vacationer.
- holkar state — a former state of central India, ruled by the Holkar dynasty of Maratha rulers of Indore (18th century until 1947)
- holkham hall — a Palladian mansion near Wells in Norfolk: built 1734–59 by William Kent for Thomas Coke
- holoplankton — plankton that spend their entire life cycle as free-swimming organisms (opposed to hemiplankton).
- hydraulicked — (of an extracted mineral) excavated using water
- hyperkalemia — an abnormally high concentration of potassium in the blood.
- hyperkalemic — Having a high percentage of potassium in one's blood.
- hypokalaemia — Alternative form of hypokalemia.
- in the black — lacking hue and brightness; absorbing light without reflecting any of the rays composing it.
- jack-the-lad — a young man who is regarded as a brash, loud show-off
- jackson hole — a valley in NW Wyoming, near the Teton Range: wildlife preserve.
- kachina doll — a Hopi Indian doll carved from cottonwood root in representation of a kachina and given as a gift to a child or used as a household decoration.
- kaffeeklatch — Alternative spelling of coffee klatch.
- kaleidophone — an instrument, invented by Professor Charles Wheatstone (1802-1875), consisting of a light on a vibrating rod with a reflecting knob for exhibiting the effect of sound waves
- keratohyalin — (biology) A protein structure found in granules in the stratum granulosum of the epidermis, which may be involved in keratinization, and in Hassall corpuscles in the thymus.
- killer whale — any of several predatory dolphins, especially the black-and-white Orcinus orca, found in all seas.
- kingdom hall — a meeting place of Jehovah's Witnesses for religious services.
- kitchen salt — coarse salt that is used in cooking but not at the table
- klamath weed — the St.-John's-wort, Hypericum perforatum.
- knuckleheads — Plural form of knucklehead.
- lake charles — a city in SW Louisiana.
- lake herring — a cisco or whitefish, especially Coregonus artedii, of the Great Lakes.
- lambeth walk — a spirited ballroom dance popular, especially in England, in the late 1930s.
- latchkey kid — variant form of latchkey child
- leatherbacks — Plural form of leatherback.
- leathernecks — Plural form of leatherneck.
- like a charm — perfectly; successfully
- loansharking — the practice of lending money at excessive rates of interest.
- machtpolitik — power politics
- mail-cheeked — (of certain fishes) having the cheeks crossed with a bony plate.
- malt whiskey — Malt whiskey or malt is whiskey that is made from malt.
- north kvaløy — an island in the Arctic Ocean, off the N coast of Norway. Area: 329 sq km (127 sq miles)
- packed lunch — A packed lunch is food, for example sandwiches, which you take to work, to school, or on a trip and eat as your lunch.
- parish clerk — an official designated to carry out various duties, either for a church parish or a parish council
- pelican hook — a hooklike device for holding the link of a chain or the like, consisting of a long shackle with a hinged rod held closed with a sliding ring.
- pigtail hook — a screw hook having an eye in the form of a spiral for holding a loop, chain link, etc., at any angle.
- play chicken — to engage in a test of courage in which, typically, two vehicles are driven directly toward one another in order to see which driver will swerve away first
- prickly heat — a cutaneous eruption accompanied by a prickling and itching sensation, due to an inflammation of the sweat glands.
- salad shaker — a portable plastic container which is used for storing salad and which has a separate compartment for salad dressing. The dressing is put on the salad just before it is eaten and the container can then be shaken to spread the salad dressing evenly.
- schappe silk — a yarn or fabric of or similar to spun silk.