[*] 236. Nouns of Agency properly denote the agent or doer of an action. But they include many words in which the idea of agency has entirely faded out, and also many words used as adjectives. [*] 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.; -trīx, F.
|can-tor, can-trīx, singer;||can-ere (root CAN), to sing.|
|vic-tor, vic-trīx, conqueror (victorious);||vinc-ere (VIC), to conquer.|
|tōn-sor (for † tond-tor ), tōns-trīx (for|
|† tond-trīx ), hair-cutter;||tond-ēre (TOND as root), to shear.|
|petī-tor, candidate;||pet-ĕre (PET; petī- 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 tōr- (§ 234. 2.15), which is shortened in the nominative.[*] b. t-, M. or F., added to verb-stems makes nouns in -es (-itis, -etis; stem it-, et-） descriptive of a character:—
- prae-stes, -stitis , (verb-stem from root STA, stāre, stand), guardian.
- teges, -etis (verb-stem tege-, cf. tegō, cover), a coverer, a mat.
- pedes, -itis ( pēs , ped-is, foot, and I, root of īre, go), foot-soldier.
- com-bibō (BIB as root in bibō , bibere, drink), a pot-companion.
- gerō, -ōnis (GES in gerō , gerere, carry), a carrier.
[*] Note.--This termination is also used to form many nouns descriptive of personal characteristics (cf. § 255).