20-letter words containing a, t, h, e, r
- (god) save the mark! — an exclamation of humorous astonishment, irony, contempt, etc.
- a bolt from the blue — a sudden, unexpected, and usually unwelcome event
- a drop in the bucket — an amount very small in relation to what is needed or desired
- a shoulder to cry on — If someone offers you a shoulder to cry on or is a shoulder to cry on, they listen sympathetically as you talk about your troubles.
- a trick of the light — If you say that something is a trick of the light, you mean that what you are seeing is an effect caused by the way that the light falls on things, and does not really exist in the way that it appears.
- abreast of the times — up-to-date, as in ideas, fashions, etc.; modern
- acetylcholinesterase — an enzyme in nerve cells that is responsible for the destruction of acetylcholine and thus for switching off excitation of the nerve
- acetylmethylcarbinol — acetoin.
- admiral of the fleet — an officer of the highest rank in the Royal Navy, equivalent to field marshal
- adrenocorticotrophic — stimulating the adrenal cortex
- adrenocorticotrophin — (hormone) adrenocorticotropic hormone.
- after the fashion of — like; similar to
- after-hours drinking — drinking in a pub after its legal closing time
- algorithmic language — ALGOL 60
- alkaline earth metal — any of the divalent electropositive metals beryllium, magnesium, calcium, strontium, barium, and radium, belonging to group 2A of the periodic table
- alkaline-earth metal — any of the group of bivalent metals including barium, radium, strontium, calcium, and, usually, magnesium, the hydroxides of which are alkalis but less soluble than those of the alkali metals.
- all part of the game — If you say that something is all part of the game, you are telling someone not to be surprised or upset by something, because it is a normal part of the situation that they are in.
- amana church society — a Christian community in Iowa governed by elders, with no ordained clergy: founded in Germany in 1714, in America since 1843
- analytical chemistry — a branch of chemistry that deals with the identification of compounds and mixtures (qualitative analysis) or the determination of the proportions of the constituents (quantitative analysis): techniques commonly used are titration, precipitation, spectroscopy, chromatography, etc.
- anthemius of tralles — c474–c534, Greek mathematician and architect, active in Lydia.
- anticrepuscular arch — antitwilight arch.
- antidiuretic hormone — vasopressin. Abbreviation: ADH.
- antimony oxychloride — a white, water-insoluble powder, SbOCl, used chiefly in the manufacture of antimony salts.
- apothecaries' weight — a system of weights, formerly used in pharmacy, based on the Troy ounce, which contains 480 grains. 1 grain is equal to 0.065 gram
- arches national park — a national park in E Utah: natural arch formations. 114 sq. mi. (295 sq. km).
- architectural bronze — a brass alloy of about 57 percent copper, 41 percent zinc, and 2 percent lead.
- armchair quarterback — a person who is not a quarterback (or general, etc.), but offers opinions and criticism on the performance or decisions of those who are
- as right as a trivet — in perfect health
- as straight as a die — perfectly honest
- at the crack of dawn — If you say that someone does something at the crack of dawn, you are emphasizing that they do it very early in the morning.
- at the drop of a hat — If you say that you are ready to do something at the drop of a hat, you mean that you are willing to do it immediately, without hesitating.
- at the eleventh hour — at the last moment; just before it is too late
- at two hours' notice — with notification only two hours in advance
- atmospheric pressure — Atmospheric pressure is the pressure of the atmosphere on the Earth's surface.
- attachment parenting — a style of child rearing aimed at developing a strong emotional bond between the child and primary caregiver. See also attachment (def 3a).
- axiomatic set theory — (theory) One of several approaches to set theory, consisting of a formal language for talking about sets and a collection of axioms describing how they behave. There are many different axiomatisations for set theory. Each takes a slightly different approach to the problem of finding a theory that captures as much as possible of the intuitive idea of what a set is, while avoiding the paradoxes that result from accepting all of it, the most famous being Russell's paradox. The main source of trouble in naive set theory is the idea that you can specify a set by saying whether each object in the universe is in the "set" or not. Accordingly, the most important differences between different axiomatisations of set theory concern the restrictions they place on this idea (known as "comprehension"). NBG (von Neumann-Bernays-Goedel) set theory sort of allows comprehension for all formulae without restriction, but distinguishes between two kinds of set, so that the sets produced by applying comprehension are only second-class sets. NBG is exactly as powerful as ZF, in the sense that any statement that can be formalised in both theories is a theorem of ZF if and only if it is a theorem of ZFC. MK (Morse-Kelley) set theory is a strengthened version of NBG, with a simpler axiom system. It is strictly stronger than NBG, and it is possible that NBG might be consistent but MK inconsistent. ML ("Modern Logic") is to NF as NBG is to ZF. (Its name derives from the title of the book in which Quine introduced an early, defective, form of it). It is stronger than ZF (it can prove things that ZF can't), but if NF is consistent then ML is too.
- back the wrong horse — to bet on a horse that loses the race
- bacteriochlorophylls — Plural form of bacteriochlorophyll.
- balanced three-phase — A balanced three-phase voltage or current is one in which the size of each phase is the same, and the phase angles of the three phases differ from each other by 120 degrees.
- baptism for the dead — the baptism of a living person in the place of and for the sake of one who has died unbaptized: now practiced chiefly by Mormons.
- barothermohygrograph — an automatic instrument for recording pressure, temperature, and humidity.
- be called to the bar — to become a barrister
- be hard pushed to do — If you are hard pushed to do something, you find it very difficult to do it.
- be in the market for — to wish to buy or acquire
- beat around the bush — to talk around a subject without getting to the point
- beaverhead mountains — a mountain range on the border of E Idaho and SW Montana, in the Bitterroot Range. 10,961 feet (3343 meters).
- been-there done-that — an exclamation expressing familiarity and boredom with a situation, experience, etc
- benzyl isoamyl ether — a colorless liquid, C 12 H 18 O, used in soap perfumes.
- black-throated diver — a diving bird, Gavia arctica, found in Europe and Asia, and a rare summer visitor to the UK
- blending inheritance — the blending of characteristics of the parents in the offspring, as in a pink flower that results from the mating of a red flower with a white one
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