TITTER

PRONUNCIATION: (TIT-uhr)

MEANING: verb intr.: To laugh in a nervous, restrained manner.
noun: A nervous, restrained laugh.

ETYMOLOGY: Of imitative origin. Earliest documented use: 1625.
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TRITTER - one who amplifies everything threefold

TUTTER - one given to apostrophes of mild disapproval

TITSTER - an expert in small birds