cockchafer: [18] Etymologically, cockchafer (a medium-sized beetle) is probably a ‘large gnawer’. The second part of the word, which goes back to Old English times (ceafor), can be traced to a prehistoric base *kab- ‘gnaw’, source also of English jowl. The first element, cock, may be an allusion to the species’ greater size in relation to other chafers. => jowl[cockchafer etymology, cockchafer origin, 英语词源]
"Originally: †a fine or smooth-grained sandstone ( obsolete ). In later use: a sedimentary rock composed of medium-sized particles (commonly defined as those with a diameter between 1/16 mm and either 2 or 4 mm)", Early 19th cent. From French psammite from ancient Greek ψάμμος sand + French -ite.