(colloquial) Short for Allen wrench.

An English and Scottish surname transferred from the given name derived from the given name Alan.

(organic chemistry) Any of a class of hydrocarbons having two double bonds from one carbon atom to two others - R₂C=C=CR₂; especially the parent compound CH₂=C=CH₂ (propadiene).

plural of allene

Characteristic of an allene

plural of Allen

plural of Allen

A female given name

An ecogeographic principle broadly stating that animals adapted to cold climates have relatively short limbs. Specifically, homeothermic animals in hot climates have low volume-to-surface ratios, and homeothermic animals in cold climates have high volume-to-surface ratios, due to thermal adaptation.

A bolt whose head has a hexagonal socket.