Definition of faller:
(n) :
One who falls.
(n) :
Synonym of feller (“one who cuts down trees”).
(n) :
A fruit that falls from the tree, rather than being picked.
(n) :
(engineering) A part which acts by falling, such as a stamp in a fulling mill, or the device in a spinning machine to arrest motion when a thread breaks.
(n) :
A surname.