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The Collaborative International Dictionary
Cageling

Cageling \Cage"ling\ (k[=a]j"l[i^]ng), n. [Cage + -ling] A bird confined in a cage; esp. a young bird. [Poetic]
--Tennyson. [1913 Webster] ||

Wiktionary
cageling

n. (context uncommon English) A bird that is kept confined in a cage.