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


prefix 
Definition:
 
1. being, existence
ontology
2. organism
ontogeny
[< Greek ont-, present participle of einai "be" < Indo-European]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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