The human twin birth rate in the United States rose 76% from 1980 through 2009, from 9.4 to 16.7 twin sets (18.8 to 33.3 twins) per 1,000 births. [5] The Yoruba people have the highest rate of …

Jan 2, 2026 · twin, either of two young who are simultaneously born from one mother. Twinning, common in many animals, is of two biological kinds: the one-egg (monozygotic), or identical, …

The meaning of TWIN is either of two offspring produced in the same pregnancy. How to use twin in a sentence.

The special relationship between twins allows researchers to examine the differences between genetic and environmental influences over both physical and mental health, as well as traits …

TWIN meaning: 1. either of two children born to the same mother on the same occasion: 2. one of two very similar…. Learn more.

TWIN definition: either of two children or animals brought forth at a birth. See examples of twin used in a sentence.

Define twin. twin synonyms, twin pronunciation, twin translation, English dictionary definition of twin. n. 1. One of two offspring born at the same birth. 2. One of two identical or similar people, …

Nov 26, 2024 · Twin births have risen dramatically since the 1980s. One reason is the use of reproductive technologies such as in vitro fertilization (IVF), which have made it possible for …

twin1 (twin), n., adj., v., twinned, twin•ning. n. Developmental Biology either of two children or animals brought forth at a birth. either of two persons or things closely related to or closely …

Twin definition: One of two identical or similar people, animals, or things; a counterpart.