Allen and Greenough's New Latin Grammar for Schools and Colleges
J. B. Greenough, G. L. Kittredge, A. A. Howard, Benj. L. D'Ooge, Ed.

1. mōlior, -īrī, to toil, from mōlēs (-is), mass.
2. fīniō , -īre, to bound, from fīnis, end.
3. sitiō , -īre, to thirst, from sitis, thirst.
4. stabiliō , -īre, to establish, from stabilis, stable.

[*] a. Some arise by confusion from other stems treated as i-stems:—

1. bulliō, -īre, to boil, from bulla (stem bullā-), bubble.
2. condiō, -īre, to preserve, from condus (stem condo-), storekeeper.
3. īnsāniō, -īre, to rave, from īnsānus (stem īnsāno-), mad.
4. gestiō, -īre, to show wild longing, from gestus (stem gestu-), gesture.

[*] Note.--Some of this form are of doubtful origin: as, ōrdior, begin, cf. ōrdo and exōrdium . The formation is closely akin to that of verbs in -iō of the third conjugation (p. 102).

[*] b. Some are formed with -iō from consonant stems:—

1. cūstōdiō, -īre, to guard, from cūstōs (stem cūstōd-), guardian.
2. fulguriō , -īre, to lighten, from fulgur, lightning.

[*] Note.--Here probably belong the so-called desideratives in -uriō (see § 263. 4. N.).

Verbs from Other Verbs