twin

Syllabification: (twin)

Pronunciation: /twin/

Definition of twin

1one of two children or animals born at the same birth.
a person or thing that is exactly like another:there was a bruise on his cheek, a twin to the one on mine
(the Twins) the zodiacal sign or constellation Gemini.

2something containing or consisting of two matching or corresponding parts, in particular.
a twin-bedded room.
a twin-engined aircraft.
a twinned crystal.

[attributive]

forming, or being one of, a pair born at one birth:she gave birth to twin boys her twin sister
forming a matching, complementary, or closely connected pair:the twin problems of economic failure and social disintegration
Botany growing in pairs:twin seed leaves
(of a bedroom) containing two single beds.
(of a crystal) twinned.

[with object] (usually be twinned)

link; combine:the company twinned its core business of brewing with that of distilling

Origin:

late Old English twinn 'double', from twi- 'two'; related to Old Norse tvinnr. Current verb senses date from late Middle English

Definition of twin in the British & World English dictionary