noun, plural pro·sto·mi·a [proh-stoh-mee-uh] /proʊˈstoʊ mi ə/.
Origin of prostomium
Examples from the Web for prostomium
Prostomium: The region in front of the mouth; the preoral part of the head.The Sea-beach at Ebb-tide|Augusta Foote Arnold
Prostomium wider than long, deeply bilobed, the median tentacle inserted deeply in the intervening incision.
Prostomium of usual general form; consisting of fourteen or fifteen rings.
Prostomium with a lateral process or horn on each side in front, notched in front at middle.
Prostomium generally small, sometimes prolonged, but never bearing tentacles or processes.