Entry 2 senses Webster, 1913 Girasole · Gir·a·sole · IPA 01 n. See Heliotrope. 1. See Heliotrope.(Bot.) [Obs.] See: Heliotrope 2. A variety of opal which is usually milk white, bluish white, or sky blue; but in a bright light it reflects a reddish color.(Min.)