A young cuttle; a small or immature cuttlefish.
From 'cuttle' + the diminutive suffix '-ling' (used in English for young animals, as in 'duckling' or 'gosling').
The '-ling' suffix historically meant 'a little one' or 'offspring'—so a cuttling, duckling, and gosling all use the same thousand-year-old English diminutive to say 'baby creature.'
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