One twin, the 'donor' twin, is small and anemic, the other, the 'recipient' twin, is large and polycythemic. The lives of both twins are endangered by this condition.

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.

TWIN definition: 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.

1. Being two or one of two offspring born at the same birth: twin sisters. 2. Being two or one of two identical or similar people, animals, or things: twin cities; a twin bed. 3. Botany Of or relating to …

Dec 14, 2025 · twin (plural twins) Either of two people (or, less commonly, animals) who shared the same uterus at the same time; one who was born at the same birth as a sibling. synonyms

Definition of twin noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

either of two persons or things closely resembling each other. adj. [before a noun] being a twin or twins: twin sisters. being two persons or things closely related to each other. being one of a …

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 …