19-letter words containing a, v, i, n, p
- reciprocal leveling — leveling between two widely separated points in which observations are made in both directions to eliminate the effects of atmospheric refraction and the curvature of the earth.
- relative complement — the set of elements contained in a given set that are not elements of another specified set.
- relative impediment — a fact or circumstance that disqualifies from lawful marriage persons who are closely related.
- republic of vietnam — the name (from 1955–75) for South Vietnam, as an independent republic, following the division of the country in 1954 into North Vietnam and South Vietnam
- reserved occupation — in time of war, an occupation from which one will not be called up for military service
- sensory deprivation — the experimental or natural reduction of environmental stimuli, as by physical isolation or loss of eyesight, often leading to cognitive, perceptual, or behavioral changes, as disorientation, delusions, or panic.
- separation negative — Photography. a black-and-white negative of one of the additive primary colors used to form a color image.
- speculative fiction — a broad literary genre encompassing any fiction with supernatural, fantastical, or futuristic elements
- supernatural virtue — one of the three graces: faith, hope, or charity, infused into the human intellect and will by a special grace of God.
- tamper-evident seal — A tamper-evident seal is a sealing device designed to reveal if the opening of a container has been interfered with.
- the provisional ira — the unofficial faction of the IRA that became increasingly dominant following a split in 1969. The Provisional movement remained committed to a policy of terrorism until its ceasefires of the mid-1990s
- travelling expenses — expenses that are paid to someone, for example, by their employer, for the costs they need to travel
- universal recipient — a person with blood type AB, able to receive blood from a person of any blood type but able to donate blood only to a person with the same blood type
- university hospital — a hospital that is affiliated with a university. University hospitals provide clinical education and training to future and current doctors, nurses, and other health professionals, in addition to delivering medical care to patients
- vapor recovery unit — A vapor recovery unit is a system for recovering vapors from inside sealed crude oil or condensate tanks, with a scrubber (= a device for removing unwanted substances) and compressor (= a device that raises pressure).
- visual display unit — video display terminal. Abbreviation: VDU.
- vitamin b (complex) — a group of unrelated water-soluble vitamins found in liver, yeast, etc., including: a) vitamin B1 (see thiamine) b) vitamin B2 (see riboflavin) c) vitamin B6 (see pyridoxine) d) nicotinic acid e) pantothenic acid f) biotin g) inositol h) para-aminobenzoic acid i) choline j) folic acid k) vitamin B12 a complex vitamin, C63H90N14O14PCo, containing trivalent cobalt, essential for the normal maturation of erythrocytes, and for normal growth and neurological function, and used esp. in treating pernicious anemia and as an animal feed supplement