â¢ MORELLO (noun) The noun MORELLO has 2 senses: 1. any of several cultivated sour cherry trees bearing fruit with dark skin and juice. 2. cultivated sour cherry with dark-colored skin and juice. Familiarity information: MORELLO used as a noun is rare.
Petiole. In botany, the petiole is the stalk attaching the leaf blade to the stem. The petiole is the transition between the stem and the leaf blade, and usually has the same internal structure as the stem. Outgrowths appearing on each side of the petiole are called stipules.
Wiktionary (0.00 / 0 votes) Rate this definition: leaf (Noun). The usually green and flat organ that represents the most prominent feature of most vegetative plants. leaf (Noun). Anything resembling the leaf of a plant.leaf (Noun). A sheet of any substance beaten or rolled until very thin. gold leaf. leaf (Noun).eaf (noun). something which is like a leaf in being wide and thin and having a flat surface, or in being attached to a larger body by one edge or end; as : (a) A part of a book or folded sheet containing two pages upon its opposite sides.