Giggle

v. t.	1.	To laugh with short catches of the breath or voice; to laugh in a light, affected, or silly manner; to titter with childish levity. [imp. & p. p. Giggled ; p. pr. & vb. n. Giggling .] Giggling and laughing with all their might At the piteous hap of the fairy wight. - J. R. Drake.
n.	1.	A kind of laugh, with short catches of the voice or breath; a light, silly laugh.

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

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, chortle, convulsion, crow, fit of laughter, gales of laughter, go into convulsions, ha-ha, hearty laugh, hee-haw, hee-hee, hilarity, ho-ho, horselaugh, joke, laugh it up, laugh outright, laughing, laughter, nearly die laughing, outburst of laughter, peal of laughter, prank, risibility, roar of laughter, roar with laughter, shake like jelly, shake with laughter, shout, shout of laughter, shriek, snigger, sniggle, snort, split, split with laughter, tee-hee, twitter, yuck, yuk-yuk