La Luna en el mar rïela (8)
Cólera, impetuoso torbellino (11)
Horas de confianza y de delicias (11)
En cárdenos matices cambiaban (11)
Rüido de pasos de gente que viene (12)
The same word without dieresis:
Por las losas deslízase sin ruido (11)
In certain words, such as cruel, metrical custom preserves a pronunciation in which the adjacent vowels have separate syllabic value. Traditional grammar, represented by the Academy, asserts that such is the correct pronunciation of these words to this day; but the actual speech of the best speakers diphthongizes these vowels, and their separation in poetry must rank as a dieresis. In printing poetry it is customary to print the mark of dieresis on many words in which dieresis is regular as well as on those in which it is exceptional.
SYNALEPHA
Synalepha is the combining into one syllable of two or more adjacent vowels or diphthongs of different words. It is the same phenomenon as syneresis extended beyond the single word. H does not prevent synalepha. The number of synalephas possible in a single verse is theoretically limited only by the number of syllables in that verse. A simple instance: