demantoid

[dih-man-toid]

de·man·toid

[dih-man-toid]
noun Mineralogy.
a brilliant green variety of andradite garnet, used as a gem.
Also called Uralian emerald.


Origin:
1890–95; < German, equivalent to (obsolete) Demant diamond (< Middle High German diemant < Old French diamant) + -oid -oid
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Demantoid is always a great word to know.
So is quincunx. Does it mean:
a gadget; dingus; thingumbob.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Collins
World English Dictionary
demantoid (dɪˈmæntɔɪd)
 
n
a bright green variety of andradite garnet
 
[C19: from German, from obsolete Demant diamond, from Old French diamant + -oid]

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