† obˈsibilate,v.Obs.rare—0. [f.ppl. stem of L. obsibilāre, f.ob- (ob-) + sibilāre to hiss, whistle.] (See quot.) Hence † obsibiˈlation. 1656Blount Glossogr., Obsibilate, to make a whistling noise, as Trees stirred with winds.1658Phillips, Obsibilation, a hissing against.