tun

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tun / tən/ • n. 1. a large beer or wine cask. ∎  a brewer's fermenting vat. 2. an imperial measure of capacity, equal to 4 hogsheads. 3. (also tun shell) a large marine mollusk (family Tonnidae) that has a rounded barrellike shell with broad spirals.• v. (tunned, tunning) [tr.] archaic store (wine or other alcoholic drinks) in a tun.

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