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onycholysis
onychomycosis
onychopathy
onychophoran
onychorrhexis
onychosis
-onym
onymous
onyx
oo-
ooch (1)
ooch (2)
oocyst
oocyte
OODA Loop
oodles
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onyx

on·yx [ ónniks ]


noun 
Definition:
 
fine-grained mineral used as gemstone: a semiprecious stone that is a fine-grained variety of chalcedony with bands of different colors. Use: gems, cameo work.

[13th century. Directly and via Old French and Latin< Greek onux "fingernail, claw"]
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