Girasole GirasolGir"a*sole Gir"a*sol\, n. [It. girasole, or F. girasol, fr. L. gyrare to turn around + sol sun.]1. (Bot.) See Heliotrope. [Obs.] 2. (Min.) A variety of opal which is usually milk white, bluish white, or sky blue; but in a bright light it reflects a reddish color.