/jir"euh sawl', -sol'/ , n.
1. an opal that reflects light in a bright luminous glow.
2. See Jerusalem artichoke (def. 1).
adj.
3. (of a stone) translucent and bluish-white with reddish reflections under strong light; opalescent.
Also, girasole /jir"euh sohl'/ , girosol .
[ 1580-90; gira ( re ) to turn (see GIRANDOLE) + sole the sun; cf. PARASOL ]