Real Dictionary

palm
The palm of your hand is the inside part.
variable noun: A palm or a palm tree is a tree that grows in hot countries. It has long leaves growing at the top, and no branches.

palm in American English 1
any of an order (Arecales) of tropical or subtropical monocotyledonous trees and shrubs, having a woody, usually unbranched, trunk and large, evergreen, featherlike or fan-shaped leaves growing in a bunch at the top
designating the only family (Arecaceae) of palms, including the coconut palm, betel palm, and date palm
noun: the part of the inner surface of the hand that extends from the wrist to the bases of the fingers
transitive verb: to conceal in the palm, as in cheating at cards or dice or in juggling

palm in American English 2
the inner part or surface of the hand between the fingers and wrist
to hide (something) in the palm or between the fingers, as in a sleight-of-hand trick
noun: any of numerous plants of the family Palmae, most species being tall, unbranched trees surmounted by a crown of large pinnate or palmately cleft leaves

palm in British English 1
noun: the inner part of the hand from the wrist to the base of the fingers

palm in British English 2
noun: any treelike plant of the tropical and subtropical monocotyledonous family Arecaceae (formerly Palmae or Palmaceae), usually having a straight unbranched trunk crowned with large pinnate or palmate leaves