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oocyte
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opacify

o·pac·i·fy [ ō pássə f ] (past and past participle o·pac·i·fied, present participle o·pac·i·fy·ing, 3rd person present singular o·pac·i·fies)


transitive and intransitive verb 
Definition:
 
become or make opaque: to become opaque, or make something opaque

[Early 20th century. <opacity]

o·pac·i·fi·er noun
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