twin axis noun

The axis of symmetry of a twin crystal

twin bed noun

Either of a matching pair of single beds

twin-beddˈed adjective

twin birth noun

1. A birth of twins
2. A twin
3. A pair of twins

twinˈ-born adjective

Born at the same birth

twin brother noun

A brother born at the same birth

twin-camˈ adjective

(of an engine) having two camshafts

twin crystal or twinned crystal noun (crystallography, mineralogy)

A crystal composed of two or more individuals in a systematic crystallographic orientation with respect to one another

twin-enˈgined adjective

(chiefly of an aircraft) having a pair of engines

twinˈflower noun

A N American plant of the genus Linnaea having paired flowers

twin-lensˈ adjective

(of a camera) having two identical sets of lenses

twin paradox noun

A phenomenon suggested by the theory of relativity which imagines a scenario in which one of a pair of twins lives in the normal way, while the other twin is sent out in a spaceship travelling at great speeds, with the effect that the travelling twin eventually returns younger than the other twin

twin plane noun

The plane of symmetry of a twin crystal

twinˈ-screw adjective

(of a ship) with two propellers on separate shafts

twinˈset noun

A cardigan and jumper made more or less to match

twin sister noun

A sister born at the same birth

twin town noun

A town paired with another foreign town of similar size for the purpose of social, cultural and commercial exchanges

twinˈ-track adjective

Consisting of or split between two simultaneous, complementary or reciprocal elements, activities, jobs, etc

twinˈ-tub noun

A type of washing machine with separate drums for washing and spin-drying (also adjective)