An obsolete or rare word, though it may refer to a young dolphin or, in dialect, a lump or bump.
From Middle Dutch 'dolfijn' and Old French 'dauphin,' which originally meant a young dolphin but evolved to become a royal title. The specific form 'dolph' is archaic English.
The word 'Dauphin' (heir to the French throne) literally means 'young dolphin' in French—royal heraldry used a dolphin as a symbol, so the title became permanently tied to an animal that represents innocence and playfulness.
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