—— sēd, [85], 3.
olle, archaic for ille, [87].
-olus (a, um), [148], 1.
-om, later -um in 2d decl., [23].
-on, Greek nouns, 2d decl. in, [27].
Onomatopœia, [375], 4.
opera, operae, [61].
Operations of nature, impersonal verbs expressing, [138], 1.
opīniōne with comparatives, [217], 4.
opis, [57], 6;