tricostate

tri·cos·tate

[trahy-kos-teyt, -kaw-steyt]
adjective Botany, Zoology.
having three ribs, costae, or raised lines.

Origin:
1860–65; tri- + costate

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tricostate (traɪˈkɒsteɪt) [Click for IPA pronunciation guide]
 
adj
biology having three ribs or riblike parts: tricostate leaves
 
[C19: from tri- + costate]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Tricostate is always a great word to know.
So is quincunx. Does it mean:
a fool or simpleton; ninny.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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