20-letter words containing b, i, l, y
- nickel tetracarbonyl — nickel carbonyl.
- physical double star — two stars that appear as one if not viewed through a telescope with adequate magnification, such as two stars that are separated by a great distance but are nearly in line with each other and an observer (optical double star) or those that are relatively close together and comprise a single physical system (physical double star)
- probability function — the function the values of which are probabilities of the distinct outcomes of a discrete random variable
- relative probability — a measure or estimate of the degree of confidence one may have in the occurrence of an event, defined as the limit of the proportion observed in a sample as the sample size tends to infinity
- royal british legion — an organization founded in 1921 to provide services and assistance for former members of the armed forces
- ruby-crowned kinglet — an olive-gray, American kinglet, Regulus calendula, the male of which has an erectile, ruby crest.
- self-belaying system — (in climbing) equipment used to pay out rope as required and thus enable a climber to self-belay
- sir william berkeley — Busby [buhz-bee] /ˈbʌz bi/ (Show IPA), (William Berkeley Enos) 1895–1976, U.S. choreographer and musical-film director.
- subscription library — a commercial lending library
- tetrahydrocannabinol — a compound, C 21 H 30 O 2 , that is the physiologically active component in cannabis preparations (marijuana, hashish, etc.) derived from the Indian hemp plant or produced synthetically. Abbreviation: THC.
- that will be the day — I look forward to that
- to tighten your belt — If you have to tighten your belt, you have to spend less money and manage without things because you have less money than you used to have.
- tribromoacetaldehyde — bromal.
- unemployment benefit — an allowance of money paid, usually weekly, to an unemployed worker by a state or federal agency or by the worker's labor union or former employer during all or part of the period of unemployment.
- walton and weybridge — a city in Surrey, SE England: a London suburb.
- westminster assembly — a convocation that met at Westminster, London, 1643–49, and formulated the articles of faith (Westminster Confession of Faith) that are accepted as authoritative by most Presbyterian churches.
- would you believe it — If you say would you believe it, you are emphasizing your surprise about something.
- yellow-billed cuckoo — a North American cuckoo, Coccyzus americanus, that has a yellow bill and, unlike many cuckoos, constructs its own nest and rears its own young.
- yellow-billed magpie — either of two corvine birds, Pica pica (black-billed magpie) of Eurasia and North America, or P. nuttalli (yellow-billed magpie) of California, having long, graduated tails, black-and-white plumage, and noisy, mischievous habits.