TOPAZ

noun Etymology: Middle English topace, from Anglo-French, from Latin ~us, from Greek ~os Date: 13th century 1. a mineral that is essentially a silicate of aluminum and usually occurs in orthorhombic translucent or transparent crystals or in white translucent masses, a usually yellow to brownish-yellow transparent mineral ~ used as a gem, a yellow sapphire, a yellow quartz, either of two large brilliantly colored South American hummingbirds ( Topaza pella and T. pyra )