Botanical stoma, e.g. (4)
I believe the answer is:
pore
(Other definitions for pore that I've seen before include "Sweat gland" , "Rope around the skin-opening" , "Closely study" , "Sweat-gland opening" , "Small hole" .)
I believe the answer is:
pore
(Other definitions for pore that I've seen before include "Sweat gland" , "Rope around the skin-opening" , "Closely study" , "Sweat-gland opening" , "Small hole" .)