say it: STOH-muh
stoma is a noun meaning "a minute epidermal pore in a leaf or stem through which gases and water vapor can pass". It carries 2 recorded senses.
a mouth or mouthlike opening (especially one created by surgery on the surface of the body to create an opening to an internal organ)
surgery
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for stoma come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.