'incurved' originates from English, formed by the prefix 'in-' (from Latin 'in-') meaning 'in' or 'into' combined with the adjective 'curved' (ultimately from Latin 'curvus').

'incurved' developed from the verb/adjective 'incurve' used in Middle English, itself a combination of Latin-derived prefix 'in-' and 'curve' (from Old French/Middle English from Latin 'curvus'), and came to be used as the past-participle/adjective 'incurved'.

Initially it essentially meant 'bent or turned inward' and over time has retained this core meaning as 'curved inward'.