crag

The word 'crag' entered Middle English from Celtic languages, specifically from words like Welsh 'craig' and Gaelic 'creag', both signifying a rock or stone mass. It is a prime example of a substrate word, absorbed into English from the languages spoken in Britain prior to and alongside the Anglo-Saxon settlements, reflecting the physical landscape. Unlike many classical loanwords, its journey is not through Latin or Greek but through direct contact with the insular Celtic peoples. The term has consistently denoted a rugged, steep rock formation, preserving its core meaning as it became a specialized term in English for a cliff or prominent rocky outcrop.

The word 'crag' is a simplex word of Celtic origin, likely from the Welsh 'craig' or Scottish Gaelic 'creag', meaning "rock" or "cliff." It functions as a single, unanalyzable morpheme in modern English.