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pronominal
pronominalize
pronoun
pronounce
pronounced
pronto
Prontosil
pronuclear
pronucleus
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proof
proof of purchase
proof sheet
proof spirit
proof theory
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pronucleus
pro·nu·cle·us [ prō nklee əss ] (plural pro·nu·cle·i [ prō nklee  ] or pro·nu·cle·us·es)


noun 
Definition:
 
nucleus of ovum or spermatozoan: the nucleus of a fully matured ovum or spermatozoan before the nuclei are fused during fertilization
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