The compound "split-finger" is a modern descriptive term from American baseball, originating in the late 20th century. It is formed by combining the adjective "split," implying a division or separation, with the noun "finger," directly describing the physical configuration of the hand. The logic is entirely transparent: the name literally denotes the "split finger" grip used by the pitcher. This compound follows a common English pattern for creating technical terms, where an action or characteristic ("split") is directly attached to the body part ("finger") executing it, resulting in a specialized sporting term.

Structure: split (divided) + finger (digit) - split: From Middle Dutch splitten, of Germanic origin. In this compound, it functions as an adjective meaning "divided" or "separated." - finger: From Old English finger, of Germanic origin. In this compound, it functions as a noun referring to a digit of the hand.