1
a
: a mineral that is essentially a silicate of aluminum and usually occurs in orthorhombic translucent or transparent crystals or in white translucent masses
b
: a usually yellow to brownish-yellow transparent mineral topaz used as a gem
c
: a yellow sapphire
d
: a yellow quartz
2
: either of two large brilliantly colored South American hummingbirds (Topaza pella and T. pyra)
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Merriam-Webster unabridged
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