Entry 1 sense Webster, 1913 Gyrogonite /(jĭ*rŏg"ō̇*nīt)/ · Gy·rog·o·nite · IPA 01 n. The petrified fruit of the Chara hispida, a species of stonewort. See Stonewort. 1. The petrified fruit of the Chara hispida, a species of stonewort. See Stonewort.(Paleon.) See: Stonewort