syl·la·ble 
(sĭlə-bəl)
(sĭlə-bəl)n.
1.
a. A unit of spoken language consisting of a single uninterrupted sound formed by a vowel, diphthong, or syllabic consonant alone, or by any of these sounds preceded, followed, or surrounded by one or more consonants.
b. One or more letters or phonetic symbols written or printed to approximate a spoken syllable.
2. The slightest bit of spoken or written expression: Do not alter a syllable of this message.
tr.v. syl·la·bled, syl·la·bling, syl·la·bles
To pronounce in syllables.
[Middle English sillable, from Anglo-Norman, alteration of Old French sillabe, from Latin syllaba, from Greek sullabē, from sullabein, second aorist of sullambanein, to combine in pronunciation : sun-, syn- + lambanein, to take.]