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ontology
onus
onward
onychogryphosis
onycholysis
onychomycosis
onychopathy
onychophoran
onychorrhexis
onychosis
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oogonium

o·o·go·ni·um [  ə gṓnee əm ] (plural o·o·go·ni·a [  ə gṓnee ə ] or o·o·go·ni·ums)


noun 
Definition:
 
1. cell in ovary: a cell in the ovary that develops into an oocyte

2. algal sex organ: the female sex organ of some algae and fungi that contains oospheres

[Mid-19th century. <oo- + Greek gonos "generation, seed"]

o·o·go·ni·al adjective
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