saprostomous (adj.)

word-forming element in science indicating "rotten, putrid, decaying," from Greek sapros "rotting, rotten, rancid," also, of wine, "matured," which is related to sēpein "to rot," a word of unknown origin. 

"orifice, small opening in an animal body," 1680s, Modern Latin, from Greek stoma (genitive stomatos) "mouth; mouthpiece; talk, voice; mouth of a river; any outlet or inlet," from PIE root *stom-en-, denoting various body parts and orifices (source also of Avestan staman- "mouth" (of a dog), Hittite shtamar "mouth," Middle Breton staffn "mouth, jawbone," Cornish stefenic "palate"). Surgical sense is attested from 1937.