Definify.com

Webster 1913 Edition

Noun.

One who giggles or titters.

Noun.

One that giggles or titters.

giggler ‎(plural gigglers)

A person who giggles.
- 1918, Carl Sandburg, "Band Concert" in Cornhuskers, p. 24,
  Band concert public square Nebraska city. Flowing and circling dresses, summer-white dresses. Faces, flesh tints flung like sprays of cherry blossoms. And gigglers, God knows, gigglers, rivaling the pony whinnies of the Livery Stable Blues.
- 1967, Nadine Gordimer, "An Intruder" in Livingstone's Companions, New York: Viking, 1971, p. 83,
  She was not a giggler, despite her extreme youth, and she smiled the small slow smile that men brought to her face without knowing why.