incipit

the first few words (often the first line or the intonation) of a work; the incipit commonly functions like a modern-day title to identify the work in question.
Found on http://people.vanderbilt.edu/~cynthia.cyrus/ORB/orbgloss.htm

incipit

the opening word or words of a medieval Western manuscript or early printed book. In the absence of a title page, the text may be recognized, ... [1 related articles]
Found on http://www.britannica.com/eb/a-z/i/15

Incipit

Incipit is a Latin word meaning `it begins`. The incipit of a text, such as a poem, song, or book, is the first few words of its opening line. In music, it can also refer to the opening notes of a musical composition. Before the development of titles, texts were often referred to by their incipits, as with for example Agnus Dei. In the medieval .....
Found on http://en.wikipedia.org/wiki/Incipit
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