'uneven-toothed' originates from Modern English, specifically the words 'uneven' + 'toothed', where 'uneven' meant 'not level or regular' and 'toothed' is the adjectival form derived from 'tooth' meaning 'having teeth'.

'uneven' comes from the prefix 'un-' (negating) + Old English 'efen/efn' (even, level), while 'tooth' comes from Old English 'tōþ'; the compound 'uneven-toothed' is a modern compounding of these elements to describe irregular teeth.

Initially, the components described 'not level' and 'having teeth' separately; over time the compound came to specifically describe the condition of teeth being irregular in size or alignment.