— tourmalinic /toor'meuh lin"ik/ , adj.
/toor"meuh lin, -leen'/ , n.
any of a group of silicate minerals of complex composition, containing boron, aluminum, etc., usually black but having various colored, transparent varieties used as gems.
Also, tourmalin /toor"meuh lin/ , turmaline .
[ 1750-60; earlier tourmalin Turmalin , ult. toramalliya carnelian; see -IN 2 ]