noun which may take the genitive case particle 'no', na-adjective
Describes something roughly the size of a human palm; used for small objects, devices, or creatures. Often appears in compound nouns like 掌大の本 (a palm-sized book).
彼は掌大のノートをポケットから取り出した。
He took a palm-sized notebook out of his pocket.
その掌大なロボットは机の上を走り回る。
The tiny robot runs around on the desk.