'non-elongate' originates from English, specifically the prefix 'non-' (from Latin 'non') attached to 'elongate', which derives from Latin 'elongatus' / 'elongare', where 'e-' meant 'out' and 'longus' meant 'long'.

'elongate' changed from Latin words 'elongare'/'elongatus' and entered English via Late Latin and Medieval/early Modern borrowings to become the modern English word 'elongate'; 'non-' has long been used in English as a negating prefix.

Initially, Latin 'elongare' meant 'to make long' (to lengthen); over time English 'elongate' retained the sense 'to lengthen or become longer', and 'non-elongate' is formed by adding the negating prefix to mean 'not elongated'.