Titter

v. t.	1.	To laugh with the tongue striking against the root of the upper teeth; to laugh with restraint, or without much noise; to giggle. [imp. & p. p. Tittered ; p. pr. & vb. n. Tittering.] A group of tittering pages ran before. - Longfellow.
n.	1.	A restrained laugh.
v. i.	1.	To seesaw. See Teeter.

Noun	1.	titter - a nervous restrained laugh
Verb	1.	titter - laugh nervously; "The girls giggled when the rock star came into the classroom" Synonyms: giggle

Homeric laughter, be in stitches, belly laugh, boff, boffola, break up, burst into laughter, burst of laughter, burst out, burst out laughing, burst with laughter, bust a gut, cachinnate, cachinnation, cackle, chortle, chuckle, convulsion, crow, fit of laughter, gales of laughter, giggle, go into convulsions, guffaw, ha-ha, hearty laugh, hee-haw, hee-hee, hilarity, ho-ho, horselaugh, laugh, laugh it up, laugh outright, laughing, laughter, nearly die laughing, outburst of laughter, peal of laughter, risibility, roar, roar of laughter, roar with laughter, shake like jelly, shake with laughter, shout, shout of laughter, shriek, snicker, snigger, sniggle, snort, split, split with laughter, tee-hee, twitter, yuck, yuk-yuk