n.
Excitation of one's own or another's genital organs, usually to orgasm, by manual contact or means other than sexual intercourse.
masturbator mas'tur·ba'tor n.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.