a. Nouns denoting the agent or doer of an action are formed from roots or verb-stems by means of the suffixes -
-tor (-sor), M.; -tríx, F.
|can-tor, can-tríx, singer;|
|vic-tor, vic-tríx, conqueror (victorious);||vinc-ere (VIC), to conquer.|
|tón-sor (for tond-tor), tóns-tríx (for|
|tond-tríx), hair-cutter;||tond-ére (TOND as root), to shear.|
|petí-tor, candidate;||pet-ere (PET; petí- as stem), to seek.|
NOTE 1: The termination -tor (-sor) has the same phonetic change as the supine ending -tum (-sum), and is added to the same form of root or verb-stem as that ending. The stem-ending is tór- (§ 234. II. 15), which is shortened in the nominative.
NOTE 2: The feminine form is always -tríx. Masculines in -sor lack the feminine, except expulsor (expultríx) and tónsor (tónstríx).
b. t-, M. or F., added to verb-stems makes nouns in -es (-itis, -etis; stem it-, et-) descriptive of a character: -
c. -ó (genitive -ónis, stem ón-), M., added to verb-stems[So conceived, but perhaps this termination was originally added to noun-stems.] indicates a person employed in some specific art or trade: -
NOTE: This termination is also used to form many nouns descriptive of personal characteristics (cf. § 255).