Definitions

1. adjective

relating to or consisting of stomata

“Stomatal movement in plants is a vital process for gas exchange.”

2. noun

a stoma, especially one in a plant leaf, through which gases are exchanged

“The stomatal density of the leaf was studied in the research paper.”

3. noun

a stoma in a fossil plant leaf, used for dating the leaf’s age

“The stomatal index was calculated from the fossilized plant leaf.”