grandson

The word "grandson" is a transparent compound formed within Middle English from the French-derived prefix "grand-" and the native English word "son." The prefix "grand," entering English from Old French grant or grand, traces back to Latin grandis, meaning "great" or "full-grown." In the context of kinship, it was adopted to indicate a degree of removal, originally conveying a sense of "a generation older or younger." When combined with "son," a word of Proto-Germanic origin (sunuz) preserved from Old English, it logically creates the term for "the son of one's child." This pattern, established in the late medieval period, efficiently denotes lineal descent by using "grand" to signal a step down (or up) the generational ladder from the core familial term.

Structure: grand (great, one generation removed) + son (male child) grand: From Latin grandis (great, large, full-grown). In English, it functions as a prefix denoting a family relationship one generation removed. son: From Old English sunu (male child, son). It functions as the core noun denoting the male offspring.