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.

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

Nov 21, 2025 · 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 …

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

Dec 13, 2025 · Identical twins, also known as monozygotic twins, share the same egg at conception and are always either both boys or both girls. Fraternal twins, also known as …

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 …

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

Twin is used to describe a pair of things that look the same and are close together. ...the twin spires of the cathedral. ...the world's largest twin-engined aircraft.

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

Sarah and her brother are twins. I didn't know she had a twin. [=a sister/brother who is her twin]