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preen (2)
preengineered
preenjoyed
preexilian
preexisting condition
prefab
prefabricate
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preembryo
pre·em·bry·o [ pree émbree  ] (plural pre·em·bry·os)


noun 
Definition:
 
fertilized egg: a fertilized ovum before implantation in the womb and before differentiation of embryonic tissue

pre·em·bry·on·ic [ pr embree ónnik ] adjective
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