-stome

1.
a combining form meaning “organism having a mouth or mouthlike organ” (cyclostome), “mouthlike organ” (cytostome), as specified by the initial element.
Compare -stomous, -stomy.
Origin
combining form representing Greek stóma mouth, and stómion little mouth
British Dictionary definitions for -stome

-stome

combining form
1.
indicating a mouth or opening resembling a mouth: peristome
Word Origin
from Greek stoma mouth, and stomion little mouth