the GNU version of the Collaborative International Dictionary of English
adj. Consisting of, or pertaining to, leaves.
The Century Dictionary and Cyclopedia
Consisting of or pertaining to leaves; inserted in, proceeding from, or resembling a leaf: as, foliar appendages.
Word Usage
"Wondering if a hidden cause of what appeared to be moisture stress might actually be nutrient deficiencies, I tried spraying liquid fertilizer directly on these gnarly leaves, a practice called foliar feeding."