rare = "leaflet".
2US A plant condition characterized by reduced leaf size; especially (a) a condition of fruit trees caused by zinc deficiency; (b) (more fully "littleleaf disease") a fungal infection of pine trees.
Attributive (usually with hyphen). = small-leaved .
Late 18th century; earliest use found in James Jenkinson (?1739–1808). From little + leaf, in sense A. 1 after post-classical Latin foliolum foliole.