either of two children or animals brought forth at a birth.

either of two persons or things closely related to or closely resembling each other.

twin bed.

Also called twin room. a type of hotel accommodation with twin beds, for occupancy by two persons. Compare double ( def. 13 ) .

Also called hemitrope. Crystallography . a compound crystal consisting of two or more parts or crystals definitely oriented each to the other; macle.

Twins, Astronomy, Astrology . the constellation or sign of Gemini.

being a twin or twins

twin sisters.

being two persons or things closely related to or closely resembling each other.

being one of a pair; identical

a twin bracelet; a twin peak.

consisting of two similar parts or elements joined or connected

a twin vase.

Botany, Zoology . occurring in pairs; didymous.

Crystallography . of the nature of a twin; hemitrope.

twofold or double.

to bring together in close relationship; pair; couple.

to furnish a counterpart to or a replica of; match.

Informal . to divide or convert into two, parts, similar items, etc.

The old movie palace will be twinned, making two smaller theaters.

Informal . to link or combine with

The new grocery store is twinned with a restaurant.

Crystallography . to form into a twin.

Obsolete . to give birth to as twins.

to give birth to twins.

to be paired or coupled.

adjective

dissimilar , individual , singular , unlike

adjective

accompanying , bifold , binary , copied , corresponding , coupled , double , dual , duplicating , geminate , identical , joint , like , matched , matching , paired , parallel , same , second , selfsame , twofold , very same , bigeminal , didymous , duplicate , dyadic

noun

clone , companion , coordinate , corollary , counterpart , doppelganger , double , duplicate , fraternal twin , identical twin , likeness , look-alike , match , mate , reciprocal , ringer , siamese twin , fellow , alter ego , binate , couple , didymous , dual , fraternal , identical , lookalike , pair , sibling , two

verb

duplicate , geminate , redouble