(of a person) Having three genetic parents; that is, having been produced by a process in which the nucleus of one egg is inserted into the cytoplasm of another egg, which contains mitochondrial DNA, and then the hybrid egg is fertilized by a sperm.

Having three heads.

A car, cycle or motorbike having three wheels. / An autorickshaw, tuk-tuk, trishaw.

Having three prongs or similar parts; trifurcate.

(of an animal) having three horns

having three legs / (informal, vulgar) Having a large penis.

Something with three legs. / An intersection where three roads meet.

The cardinal number occurring after two hundred ninety-nine and before three hundred one, represented in Arabic numerals as 300.

(religion, Wicca) A religious tenet held by some Wiccans, stating that whatever energy, positive or negative, a person puts into the world will be returned threefold.

(mathematics education) A rule stating that, if two ratios are equal, then the denominator of the second equals its numerator times the reciprocal of the first ratio: if a/b=c/d then d=(bc)/a.