TITTER
titter
(noun) a nervous restrained laugh
giggle, titter
(verb) laugh nervously; “The girls giggled when the rock star came into the classroom”
Source: WordNet® 3.1
Etymology 1
Verb
titter (third-person singular simple present titters, present participle tittering, simple past and past participle tittered)
To laugh or giggle in a somewhat subdued or restrained way, as from nervousness or poorly-suppressed amusement.
(obsolete) To teeter; to seesaw.
Synonyms
• snicker; see also laugh
Noun
titter (plural titters)
A nervous or somewhat repressed giggle.
Etymology 2
Noun
titter (plural titters)
(slang, vulgar, chiefly, in the plural) A woman's breast.
Synonyms
• (a woman's breast): See also breasts.
Source: Wiktionary
Tit"ter, v. t. [imp. & p. p. Tittered; p. pr. & vb. n. Tittering.]
Etym: [Probably of imitative origin.]
Definition: 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.
Tit"ter, n.
Definition: A restrained laugh. "There was a titter of . . . delight on his
countenance." Coleridge.
Tit"ter, v. i.
Definition: To seesaw. See Teeter.
Source: Webster’s Unabridged Dictionary 1913 Edition