12-letter words containing t, h, a, l
- hazelnut oil — an oil extracted from hazelnuts and used mostly in cooking
- 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.
- headlighting — The lighting associated with a headlight.
- headmasterly — In a manner befitting a headmaster.
- headstrongly — In a headstrong manner.
- health check — a medical checkup
- health drink — a drink that claims to be beneficial to health
- health salts — magnesium sulphate or similar salts taken as a mild laxative
- health scare — a state of alarm caused by a revelation concerning public heath
- health stamp — a postage stamp with a surcharge that is used to support a health camp
- hearteningly — In a heartening way; cheeringly.
- heartfulness — The state or quality of being heartful.
- 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.
- heating bill — a bill for the supply of energy to heat a building
- heel-and-toe — noting a pace, as in walking contests, in which the heel of the front foot touches ground before the toes of the rear one leave it.
- heeling tank — either of two lateral ballast tanks permitting an icebreaker to heel and crush ice to either side.
- helianthemum — (botany) Any of the genus Helianthemum of rockroses.
- helianthuses — Plural form of helianthus.
- helicobacter — Any member of the Helicobacter bacteria.
- heliotherapy — treatment of disease by means of sunlight.
- hellgramites — Plural form of hellgramite.
- hellgrammite — the aquatic larva of a dobsonfly, used as bait in fishing.
- 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.
- 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).
- hepaticology — the scientific study of bryophyte plants known as hepatics or liverworts
- hepatomegaly — an abnormal enlargement of the liver, usually associated with liver disease or heart failure.
- hereditarily — passing, or capable of passing, naturally from parent to offspring through the genes: Blue eyes are hereditary in our family. Compare congenital.
- heritability — capable of being inherited; inheritable; hereditary.
- hermetically — so as to be airtight: hermetically sealed.
- hernioplasty — an operation for the repair of a hernia.
- hesitatingly — In a hesitating manner.
- heteroblasty — the morphological changes that occur in plants between juvenility and adulthood
- 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.
- heteroplasia — the replacement of normal cells by abnormal cells, as in cancer.
- heteroplasty — the repair of lesions with tissue from another individual or species.
- heterosexual — of, relating to, or exhibiting heterosexuality.
- heterosocial — relating to or denoting mixed-sex social relationships
- heterothally — the condition of being heterothallic
- 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
- hexobarbital — a barbiturate with hypnotic and sedative properties
- hieratically — In a hieratic way.
- high voltage — high-power electricity
- high-ability — (of a student) having a higher than average ability
- high-quality — adhering to an excellent standard of measure; of superior quality: Education depends on high-quality teachers and materials in our schools.