twin

v. bear twins; match, provide with a mate; form into a twin (Crystallography)

adj. identical; sharing a close resemblance; being either of two children or animals born at one birth; being either member of a similar or closely related pair

n. either of two children or animals born at the same birth; either of a pair of two persons or things resembling or closely related to each other; crystal composed of several parts oriented to each other (Crystallography); constellation Gemini

Twins are a form of multiple birth in which the mother gives birth to two offspring from the same pregnancy, either of the same or opposite sex.The general term for more than one offspring from the same pregnancy is multiples, for example triplets refers to cases of three offspring from the same pregnancy. A fetus alone in the womb is called a singleton.Human twins are two individuals who have shared the uterus during a single pregnancy and are usually, but not necessarily, born in close succession. Due to the limited size of the mother's womb, multiple pregnancies are much less likely to carry to full term than singleton births, with twin pregnancies lasting only 37 weeks on average, 3 weeks less than full term. Since premature births can have health consequences for the babies, twin births are often handled with special precautions.
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Noun
1. (astrology) a person who is born while the sun in in Gemini
(synonym) Gemini
(hypernym) person, individual, someone, somebody, mortal, human, soul
(classification) astrology, star divination
2. a waterfall in the Snake River in southern Idaho
(synonym) Twin Falls
(hypernym) waterfall, falls
(part-holonym) Snake, Snake River

Noun
1. either of two offspring born at the same time from the same pregnancy
(hypernym) sibling, sib
(hyponym) fraternal twin, dizygotic twin
2. a duplicate copy
(synonym) counterpart, similitude
(hypernym) duplicate, duplication
(derivation) duplicate, parallel
Verb
1. duplicate or match; "The polished surface twinned his face and chest in reverse"
(synonym) duplicate, parallel
(hypernym) match, fit, correspond, check, jibe, gibe, tally, agree
(derivation) counterpart, similitude
2. bring two objects, ideas, or people together; "This fact is coupled to the other one"; "Matchmaker, can you match my daughter with a nice young man?"; "The student was paired with a partner for collaboration on the project"
(synonym) match, mate, couple, pair
(hypernym) join, bring together
(hyponym) mismate
(verb-group) match
3. grow as twins; "twin crystals"
(hypernym) grow
4. give birth to twins
(hypernym) give birth, deliver, bear, birth, have
Adjective
1. being two identical
(synonym) duplicate, matching, twin(a), twinned
(similar) matched
2. very similar
(synonym) siamese
(similar) similar

(v. t.)
To separate into two parts; to part; to divide; hence, to remove; also, to strip; to rob.
  

(v. t.)
To cause to be twins, or like twins in any way.
  

(v. i.)
To depart from a place or thing.
  

(v. i.)
To bring forth twins.
  

(v. i.)
To be born at the same birth.
  

(n.)
One of two produced at a birth, especially by an animal that ordinarily brings forth but one at a birth; -- used chiefly in the plural, and applied to the young of beasts as well as to human young.
  

(n.)
A sign and constellation of the zodiac; Gemini. See Gemini.
  

(n.)
A person or thing that closely resembles another.
  

(n.)
A compound crystal composed of two or more crystals, or parts of crystals, in reversed position with reference to each other.
  

(a.)
Double; consisting of two similar and corresponding parts.
  

(a.)
Composed of parts united according to some definite law of twinning. See Twin, n., 4.
  

(a.)
Being one of two born at a birth; as, a twin brother or sister.
  

(a.)
Being one of a pair much resembling one another; standing the relation of a twin to something else; -- often followed by to or with.
  

a twin; double
  

a twin