'roughly-divided' originates from the combination of 'roughly' and 'divided', where 'roughly' means 'approximately' and 'divided' means 'separated into parts'.

'Roughly-divided' combines the adverb 'roughly' with the past participle 'divided', forming a compound adjective.

Initially, 'roughly' meant 'in a rough manner', and 'divided' meant 'separated'. Together, they convey the idea of an approximate division.