18-letter words containing h, o, t, a

northeast corridor — the long, narrow strip of land between Boston, New York City, and Washington, D.C., containing many adjacent urban areas.
northern cameroons — German Kamerun. a region in W Africa: a German protectorate 1884–1919; divided in 1919 into British and French mandates.
northern transvaal — province of South Africa, in the N part: 47,599 sq mi (123,280 sq km); pop. 5,202,000; cap. Pietersburg
not a hope in hell — If you say that someone has not got a hope in hell of doing something, you are emphasizing that they will not be able to do it.
not a pretty sight — If you say that someone or something is not a pretty sight, you mean that it is not pleasant to look at.
not breathe a word — to take air, oxygen, etc., into the lungs and expel it; inhale and exhale; respire.
not by a long shot — absolutely not
not have the heart — If you want to do something but do not have the heart to do it, you do not do it because you know it will make someone unhappy or disappointed.
not that i know of — You say 'Not that I know of' when someone has asked you whether or not something is true and you think the answer is 'no' but you cannot be sure because you do not know all the facts.
not to have a clue — to be completely baffled
oath of allegiance — pledge to one's nation
octachlorobiphenyl — (organic compound) Either of twelve isomers of the polychlorinated biphenyl containing eight chlorine atoms.
officer of the day — an officer who has charge of the guard and prisoners on an assigned day at a military installation. Abbreviation: OD, O.D., O.O.D.
offset lithography — offset (def 6).
oil of catechumens — holy oil used in baptism, the ordination of a cleric, the coronation of a sovereign, or in the consecration of a church.
old man of the sea — (in The Arabian Nights' Entertainments) an old man who clung to the shoulders of Sindbad the Sailor for many days and nights.
on that/this score — You can use on that score or on this score to refer to something that has just been mentioned, especially an area of difficulty or concern.
on the back burner — low priority
on the danger list — critically ill in hospital
on the ragged edge — precariously close to loss of self-control, mental stability, etc.
one way or another — somehow, by some means
one's heart bleeds — used to express sympathetic grief, but often used ironically
one's native heath — the place of one's birth or childhood
open heart surgery — surgery performed on the exposed heart while a heart-lung machine pumps and oxygenates the blood and diverts it from the heart.
open-heart surgery — surgery performed on the exposed heart while a heart-lung machine pumps and oxygenates the blood and diverts it from the heart.
ophthalmologically — In an ophthalmological manner.
optical brightener — an additive that dyes and brightens fabric or paper
organization chart — a diagrammatic representation showing how departments or divisions in an organization, as a large corporation, are related to one another along lines of authority.
oriental cockroach — a dark-brown cockroach, Blatta orientalis, thought to have originated in Asia but now nearly cosmopolitan in distribution.
oriental shorthair — any of a breed of domestic cat, similar to the Siamese but with greenish eyes and often a coat of a solid color
orthophthalic acid — Chemistry. any of three isomeric acids having the formula C 8 H 6 O 4 , especially the ortho isomer (orthophthalic acid) a colorless, crystalline, slightly water-soluble solid used chiefly in the manufacture of dyes, medicine, and perfume.
orthotungstic acid — an oxyacid acid of tungsten. Formula: H2WO4
out of one's hands — no longer one's responsibility
outer automorphism — an automorphism that is not an inner automorphism.
outreach programme — a programme designed to help and encourage disadvantaged members of the community
ovariohysterectomy — Surgical removal of the ovaries and uterus.
over and done with — If you say that something is over and done with, you mean that it is completely finished and you do not have to think about it any more.
overhead projector — over one's head; aloft; up in the air or sky, especially near the zenith: There was a cloud overhead.
overnight telegram — a type of domestic telegram sent at a reduced rate with a minimum charge for 10 words or less and accepted until midnight for delivery the following day.
packet switch node — (PSN) A dedicated computer whose purpose is to accept, route and forward packets in a packet-switched network.
paint the town red — a substance composed of solid coloring matter suspended in a liquid medium and applied as a protective or decorative coating to various surfaces, or to canvas or other materials in producing a work of art.
palaeoanthropology — the branch of anthropology concerned with primitive man
par for the course — an equality in value or standing; a level of equality: The gains and the losses are on a par.
parathyroid glands — any of several small oval glands usually lying near or embedded in the thyroid gland.
pass the hat round — to collect money, as for a cause
pathname separator — (file system) The character used to separate elements of a path or pathname. Under Unix and POSIX.1 compliant systems the pathname separator is the (forward) slash, in MS-DOS backslash serves the same purpose. For obvious reasons the no directory or file name can contain this character.
pathologic anatomy — the branch of pathology dealing with the morphologic changes in tissues.
patron of the arts — someone who acts as a patron to or supports charities, organizations, and individuals that work in or concern the arts
pave the way (for) — to prepare the way (for); facilitate the introduction (of)
peppermint camphor — menthol.

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