large mass of stone; cliff, crag, or other such natural feature
The barely-attested OE rocc does not survive in Middle English. Instead, according to OED, ME rocke is (re-)borrowed from multiple sources,including: AN rokke, OFr. roke, MFr. roque, rocque (c1100); also AN, OFr., MFr. & Fr. roche (end of the 10th cent.), feminine noun, and MFr. & Fr. roc (c1370), masculine noun, probably showing influence from Old Occitan (OED).
Buck, C., D. (1949). A dictionary of selected synonyms in the principal Indo–European languages: a contribution to the history of ideas. Chicago: University of Chicago Press.
Simpson, J., & Weiner, E. S. 1989. Oxford English dictionary. Oxford: Clarendon Press.
Robert Farren, PIE culture words collection, 2017
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