platinous

plat·i·nous

[plat-n-uhs]
adjective Chemistry.
containing bivalent platinum.

Origin:
1835–45; platin(um) + -ous

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platinous (ˈplætɪnəs) [Click for IPA pronunciation guide]
 
adj
of or containing platinum, esp in the divalent state

Collins English Dictionary - Complete & Unabridged 10th Edition
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Platinous is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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