plural of half-life

A broad step between flights of a staircase. / (mathematics) Either of the two parts of three-dimensional space divided by a plane.

Made half of a metal and half of some other material.

(physics) Of or relating to a half-metal.

(derogatory) A person of mixed racial parentage or ancestry, especially one of mixed white and American Indian parentage (metis, métis, Metis, Métis). / A hybrid animal or plant.

(of a person, derogatory) Having dual heritage; having mixed racial parentage or ancestry.

(historical) A pre-decimal coin used in Britain, Ireland and New Zealand, equivalent to 30 pence or two shillings and six pence

(botany) Of a plant: requiring protection against frost.

(botany) A plant that requires protection against frost.

(physics) Any substance that acts as a conductor to electrons of one spin orientation, but as an insulator to those of the opposite orientation