18-letter words containing a, f, l, e
- thermal efficiency — the ratio of the work output of a heat engine to the heat input expressed in the same units of energy.
- thorfinn karlsefni — 980–after 1007, Icelandic navigator, explorer, and leader of early colonizing expedition to Vinland, in North America.
- to fall from grace — If someone falls from grace, they suddenly stop being successful or popular.
- to fall into place — If things fall into place, events happen naturally to produce a situation you want.
- to play favourites — to display favouritism
- to pull a fast one — If you say that someone has pulled a fast one on you, you mean that they have cheated or tricked you.
- to save one's life — If you say that someone cannot do something to save their life, you are emphasizing that they do it very badly.
- too clever by half — If someone is too clever by half, they are very clever and they show their cleverness in a way that annoys other people.
- traffic controller — a person whose job is to control the flow of air traffic
- triangle of forces — a triangle whose sides represent the magnitudes and directions of three forces whose resultant is zero and which are therefore in equilibrium
- ultralow frequency — an electromagnetic wave with a frequency between 300 and 3000 hertz. Abbreviation: ULF, ulf.
- ultraviolet filter — a filter used on a lens to absorb ultraviolet radiation that may impart an undesirable blue cast to a photograph.
- universal suffrage — suffrage for all persons over a certain age, usually 18 or 21, who in other respects satisfy the requirements established by law.
- university faculty — a division within a university comprising one subject area, or a number of related subject areas
- ur of the chaldees — the city where Abraham was born, sometimes identified with the Sumerian city of Ur. Gen. 11:28, 31; 15:7; Neh. 9:7.
- vicar of wakefield — a novel (1766) by Goldsmith.
- weak nuclear force — weak interaction
- wild passionflower — the maypop, Passiflora incarnata.
- wildlife programme — (esp on television) a documentary whose subject is wild animals in their natural habitat or undomesticated fauna and flora generally
- wildlife sanctuary — an area where wild animals and plants are protected
- witch hazel family — the plant family Hamamelidaceae, characterized by trees and shrubs having alternate, simple leaves, flowers in clusters or heads, and fruit in the form of a double-beaked woody capsule, and including the sweet gum, witch alder, and witch hazel.
- woman of the world — a woman experienced and sophisticated in the ways and manners of the world, especially the world of society.
- xenon hexafluoride — a colorless, crystalline compound, XeF 6 , that melts at 50°C to a yellow liquid, and boils at 75°C.