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stomium

noun
sto·​mi·​um | \ˈstōmēəm\
plural stomia\-​ēə \ also stomiums

Definition of stomium 

1 : the thin-walled cells of the annulus marking the line or region of dehiscence of a fern sporangium

2 : the opening in an anther usually between lip cells through which dehiscence occurs

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History and Etymology for stomium

New Latin, from Greek stomion mouth

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