A supply of beetles kept for catching, studying, or breeding purposes; or the wooden shaft or stock of a beetle-catching tool.
Compound word from 'beetle' and 'stock' (meaning a supply or wooden handle), combining Old English 'bitela' with 'stocc' (a wooden post or log).
Medieval beetle-hunters kept 'beetlestock'—a maintained supply of captured beetles—probably as a form of early biodiversity management or for selling to collectors and scholars.
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