- 1(biology) a tiny pore (= hole) in the outer layer of a plant's leaf or stem
Definitions on the go
Look up any word in the dictionary offline, anytime, anywhere with the Oxford Advanced Learner’s Dictionary app.
- 2(biology) a small opening like a mouth, in some animals
- 3(medical) an artificial opening made in an organ of the body , especially in the colon or trachea
Check pronunciation: stoma