A number used to denote quantity; a counting number; a cardinal. / (mathematics) A generalized kind of number used to denote the size of a set, including infinite sets.

(archaic) A wet nurse. / A person (usually a woman) who takes care of other people’s young. / A person trained to provide care for the sick.

(transitive) To breastfeed: to feed (a baby) at the breast; to suckle. / (intransitive) To breastfeed: to be fed at the breast. / (transitive) To care for (someone), especially in sickness; to tend to.

A nurse shark or dogfish.

(number theory) A number that is less than the sum of its proper divisors (all divisors except the number itself).

(mathematics) A number that can be expressed as the ratio of two integers.

(food, broadly) Any of various hard-shelled seeds or hard, dry fruits from various families of plants. / (botany, strictly) Such a fruit that is indehiscent.

(mostly in the form "nutting") To gather nuts. / (UK, transitive, slang) To hit deliberately with the head; to headbutt. / (slang, mildly vulgar) To orgasm; to ejaculate.

(Scotland, colloquial) No.

Physically unable to feel, not having the power of sensation. / Emotionally unable to feel or respond in a normal way. / (obsolete) Causing numbness.