TITTER

titter. Titter, v.i. to laugh secretly, to giggle

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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.