[2489.] Elision seldom occurs if the syllable to be elided is immediately preceded by a vowel: as in de(am) et.
[2490.] The final syllable of a Greek word is rarely elided.
[2491.] Elision is more common toward the beginning of a verse than toward the end.
[2492.] Elision rarely occurs in the first syllable or last syllable of a verse; but see under Synapheia ([2510]), and for the elision of the enclitic -que or -ve at the end of a dactylic hexameter, see [2568].
[2493.] Ecthlipsis (Gr. ἔκθλιψις, a squeezing out). Final m and a preceding short vowel are usually elided before a vowel or h: as,
mōnstr(um) horrend(um) īnform(e) ingēns, cui lūmen ademptum, V. 3, 658.
In such cases the ending was probably not cut off altogether, but was given a faint nasal sound.
[2494.] Sometimes a monosyllable ending in a short vowel and m is not elided before a vowel: as quắm ego (Ter.); súnt cŭm odōre (Lucr.).
Such unelided monosyllables are most frequent in the early dramatists, and in them usually fall under the verse-ictus. See [61].
[2495.] The monosyllables dem, stem, rem, spem, sim, are thought never to be elided before a short vowel.