A small or baby cuttlefish, or a miniature version of a cuttle.
From 'cuttle' + the diminutive suffix '-kin' (used in English to indicate smallness, from Middle Dutch). A rare or archaic diminutive form.
The suffix '-kin' gave us 'lambkin' and 'napkin,' and while 'cuttikin' is obsolete, it shows how Medieval English loved turning creatures into cute tiny versions with one simple suffix.
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