a. Bot. and Zool. [f. Gr. στοματ-, στόμα (see STOMA) + -AL.] Pertaining to or connected with a stoma or stomata; of the nature of a stoma; loosely, having stomata, stomatous.
1861. Bentley, Man. Bot., 43. Generally … the stomatal cells are placed nearly or quite on a level with those of the epidermis. In other cases,… the stomatal cells are below the epidermal ones, while in some rare instances again they are above them.
1894. F. Darwin & Acton, Physiol. Plants, 93. Stomatal transpiration.
1897. Nature, 17 June, 167/1. The stomatal surface of a leaf.
