twin

[twin]

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noun

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.

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.

adjective

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.

verb (used with object), twinned, twin·ning.

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.

verb (used without object), twinned, twin·ning.

to give birth to twins.

to be paired or coupled.

Origin of twin

before 900; Middle English; Old English twinn (adj.), getwinn (noun and adj.); akin to Old Frisian twīne, Old Norse tvinnr double, Gothic twaihnai

Can be confusedtwain twin twine

twin

[twin]

verb (used with or without object), twinned, twin·ning. Scot.

twine².

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for twin

dual, binary, corresponding, like, joint, double, accompanying, same, parallel, second, matching, coupled, geminate, copied, likeness, reciprocal, clone, look-alike, corollary, companion

Examples from the Web for twin

Contemporary Examples of twin

Twin buglers played “Taps” and three police helicopters flew overhead in the missing-man formation.
Funeral Protest Is Too Much for NYPD Union Boss
Michael Daly
January 5, 2015
Twin girls, Greta and Grace, run around the floor in circles, wearing pink playsuits with tiny pink wings attached.
A Sunni-Shia Love Story Imperiled by al Qaeda
Ruth Michaelson
December 26, 2014
The twin entrepreneurs and stars of HGTV's Property Brothers will be taking your questions live on Tuesday, December 16 at 2pm.
Live Q&A: Drew and Jonathan Scott
The Daily Beast
December 16, 2014
Production companies he was working with discovered that he had a twin brother in the renovation industry.
How the Property Brothers Became Your Mom’s Favorite TV Stars
Kevin Fallon
November 25, 2014
The Chinook vibrated with deeper and deeper groans until its twin engines managed to heave up our dead weight.
I Shot Bin Laden
Elliot Ackerman
November 16, 2014

Historical Examples of twin

They are twin plants of the forest, and are identified with its growth.
Maid Marian
Thomas Love Peacock
That I had but eyes, to look upon these twin invaders of domestic peace!'
Barnaby Rudge
Charles Dickens
In the end a pair of twin lights were seen perched on the summit.
Homeward Bound
James Fenimore Cooper
Had not their twin brotherhood drunk life from the same source?
Fruitfulness
Emile Zola
There I left her too, for I wanted to see what the twin mice were about.
Five Mice in a Mouse-trap
Laura E. Richards

British Dictionary definitions for twin

twin

noun

either of two persons or animals conceived at the same time
(as modifier)a twin brother See also identical (def. 3), fraternal (def. 3)

either of two persons or things that are identical or very similar; counterpart
(as modifier)twin carburettors

Also called: macle a crystal consisting of two parts each of which has a definite orientation to the other

verb twins, twinning or twinned

to pair or be paired together; couple

(intr) to bear twins

(intr) (of a crystal) to form into a twin

(intr) archaic to be born as a twin

(tr)

to create a reciprocal relation between (two towns in different countries); pair (a town) with another in a different country
(intr)(of a town) to be paired with a town in a different country

Derived Formstwinning, noun

Word Origin for twin

Old English twinn; related to Old High German zwiniling twin, Old Norse tvinnr double

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for twin

adj.

Old English twinn "consisting of two, twofold, double," probably ultimately from Proto-Germanic *twinjaz (cf. Old Norse tvinnr, Old Danish tvinling, Dutch tweeling, German zwillung), from PIE *dwisno- (cf. Latin bini "two each," Lithuanian dvynu "twins"), from *dwi- "double," from root *dwo- "two" (see two). The verb meaning "to combine two things closely" is recorded from late 14c. The noun developed from Old English getwinn "double."

twin in Medicine

twin

[twĭn]

n.

One of two offspring born at the same birth.

adj.

Being two or one of two offspring born at the same birth.

Consisting of two identical or similar parts; double.

twin in Science

twin

[twĭn]

One of two offspring born of a single gestation. Identical twins result from the division of a fertilized egg. Fraternal twins result from the fertilization of two separate eggs at the same time.

A crystal structure consisting of two intergrown crystals that are mirror images of each other. Mineral twins can form as result of defective crystal growth in response to stress from rock deformation or during magma cooling.