(organic chemistry) Any hydroxy derivative of an aldehyde

A county-level city in Baoding Prefecture, Hebei, China. / (historical) Synonym of Ding Prefecture, a prefecture of imperial China with its seat at Dingzhou.

(chemistry) Any oxide containing two oxygen atoms in each molecule.

(aviation, of an aircraft) To enter, or remain in, a spin (abnormal stalled flight mode). / (aviation, of a pilot) To cause one's aircraft to enter or remain in a spin (abnormal stalled flight mode).