Etymology
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canister (n.)

late 15c., "basket," from Latin canistrum "wicker basket" for bread, fruit, flowers, etc., from Greek kanystron "basket made from reed," from kanna (see cane (n.)). It came to mean "small metal receptacle" (1711) through influence of unrelated can (n.). As short for canister shot, it is attested from 1801, so called for its casing.

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Definitions of canister

canister (n.)
a metallic cylinder packed with shot and used as ammunition in a firearm;
Synonyms: case shot / canister shot
canister (n.)
metal container for storing dry foods such as tea or flour;
Synonyms: cannister / tin
From wordnet.princeton.edu