A variant spelling of caddis; the larva of a caddisfly, or the protective case it builds from plant and mineral debris.
Early English spelling variant of 'caddis', reflecting inconsistencies in Early Modern English orthography when standardized spelling had not yet developed. The origin of 'caddis' itself is unclear but may relate to fabric terms (cadis is a type of cloth), possibly because the larval cases resemble woven material.
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