The father of one's husband or wife; -- correlative to son-in-law and daughter-in-law.
1. (Naut.) (a) A small vessel propelled by sails or oars, formerly employed as a tender, or for coast defence; -- called originally, spynace or spyne. (b) A man-of-war's boat. Whilst our pinnace anchors in the Downs. Shak. 2. A procuress; a pimp. [Obs.] B. Jonson.