(physics, chemistry) A metastable state of molecular oxygen that has a slightly higher energy than normal triplet oxygen, is diamagnetic rather than paramagnetic, and is more chemically reactive.

(trigonometry, rare) The trigonometric function defined as half the versed sine. Abbreviation: haversin

(trigonometry) The trigonometric function equal to half the coversed sine. Abbreviation: hacoversin

(trigonometry) The trigonometric function 1 − cos(x).

(trigonometry) The trigonometric function 1 − sin(x).

A kind of verse with a simple, song-like rhythm. / (colloquial, often childish) An informal gathering involving group singing.

Like a piece of sing-song; simple and melodic, song-like.

(anatomy) Any of a number of air-filled spaces, or sinuses, within the bones of the skull and face.

Alternative spelling of singjay

(simile) to have a beautiful singing voice / (simile) to divulge secrets with little coercion