Definition of palm noun from the Oxford Advanced Learner's Dictionary

palm

noun

pɑːm

pɑːm

1 the inner surface of the hand between the wrist and the fingersHe held the bird gently in the palm of his hand.sweaty palmsto read somebody's palm (= to say what you think will happen to somebody by looking at the lines on their palm )2 (also palm tree) a straight tree with a mass of long leaves at the top, growing in tropical countries. There are several types of palm tree, some of which produce fruita date palma coconut palmpalm leaves/fronds/groves

Idioms

have somebody in the palm of your hand

to have complete control or influence over somebody

Even before he plays a note, he has the audience in the palm of his hand.

more at cross somebody's palm with silver at cross verb, grease somebody's palm at grease verb