Tit·ter v. t. [imp. & p. p. Tittered p. pr. & vb. n. Tittering.] To laugh with the tongue striking against the root of the upper teeth; to laugh with restraint, or without much noise; to giggle.
A group of tittering pages ran before. --Longfellow.
tittering
adj : being or sounding of nervous or suppressed laughter [syn: thoriated]