outcrop

the word "outcrop" is a transparent compound formed from two native english elements. the first element, "out," carries its fundamental sense of being external or protruding outward. the second element, "crop," originally referred to the top or head of a plant, a meaning that evolved to denote anything that appears or sprouts at the surface. when combined in the late 18th century, primarily as a mining and geology term, the literal logic of the components perfectly described a rock formation that "crops out" or appears above the surrounding ground. this clear metaphorical construction from agricultural vocabulary to geological feature exemplifies the descriptive nature of english compound formation.

Structure: out + crop - out (old english): a word-forming element meaning "outward, external, outside, forth." - crop (old english): in this context, it means "top, sprout, head of a plant," from the sense of something that protrudes or appears at the surface.