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From Latin -or, -ōris.


Modeled after -ar and -os.


For earlier -ōs, from Proto-Indo-European *-ōs, for original *-oss, i.e. the neuter s-stem *-os with masculine nominative *-s. The ō from the nominative case was made common to all cases originally with non-ablauting o (the three exceptions were arbor, mulier and Cerēs). Afterwards nom.sg. -ōr > -or, by Latin sound laws. Thus paradoxically, as in the r-stems (soror, -tor), in the resulting paradigm the one form with a short stem vowel is the only form whose stem was etymologically long.

Old English

From Proto-Germanic *-ar-. Akin to Old High German -ar.

Old French

From Latin -(a)tor.