20-letter words containing p, e, t, i, b, o
- prime number theorem — the theorem that the number of prime numbers less than or equal to a given number is approximately equal to the given number divided by its natural logarithm.
- proactive inhibition — the tendency for earlier memories to interfere with the retrieval of material learned later
- prohibited substance — a substance, such as a drug, etc, that is banned or forbidden by law or other authority
- 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
- sailor's breastplate — a knot consisting of three overlapping loops formed by a single rope passed alternately over and under itself at crossings.
- semiautobiographical — pertaining to or being a fictionalized account of an author's own life.
- special boat service — a unit of the Royal Marines specializing in reconnaissance and sabotage
- spectroscopic binary — a binary star having components that are not sufficiently separated to be resolved by a telescope, known to be a binary only bythe variations in wavelength of emitted light that are detected by a spectroscope.
- spherical aberration — variation in focal length of a lens or mirror from center to edge, due to its spherical shape.
- spontaneous abortion — miscarriage (def 1).
- spontaneous-abortion — Also called voluntary abortion. the removal of an embryo or fetus from the uterus in order to end a pregnancy.
- spotted crane's-bill — the American wild geranium, Geranium maculatum.
- step into the breach — If you step into the breach, you do a job or task which someone else was supposed to do or has done in the past, because they are suddenly unable to do it.
- subscription edition — an edition of one or more volumes for which a number of prospective purchasers place orders, usually in advance of publication.
- switchboard operator — a person who operates an installation in a telephone exchange, office, hotel, etc, at which the interconnection of telephone lines is manually controlled
- telephone subscriber — a person who subscribes to a telephone service
- the beautiful people — rich, fashionable people in international high society
- therapeutic abortion — abortion performed when a woman's pregnancy endangers her health.
- to bring up the rear — If a person or vehicle is bringing up the rear, they are the last person or vehicle in a moving line of them.
- to disturb the peace — If someone is accused of disturbing the peace, they are accused of behaving in a noisy and offensive way in public.
- tropical disturbance — a very weak, or incipient, tropical cyclone.
- 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.
- upper income bracket — a grouping of the highest earning tax payers
- white bush (scallop) — a variety of summer squash having a saucer-shaped white fruit, scalloped around the edges
- white people problem — a fairly minor problem, complaint, etc., associated with a relatively high standard of living; a first world problem.