the GNU version of the Collaborative International Dictionary of English
n. One who, or that which, flutters.
The Century Dictionary and Cyclopedia
n. One who flutters; one who causes something to flutter.
Word Usage
"Why he called her his flutterer no one ever knew, unless it was because her ribbons were incessantly fluttering; but, had he called her his shadow, the name would have been more appropriate."