Middle English, from Old English clamm bond, fetter; akin to Old High German klamma constriction and perhaps to Latin glomus ball
clam entry 1; from the clamping action of the shells
before the 12th century, in the meaning defined above
circa 1520, in the meaning defined at sense 1a
1636, in the meaning defined above
“Clam.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/clam. Accessed 6 Dec. 2022.
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Britannica.com: Encyclopedia article about clam
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