Tamper

1. n. An instrument used in tamping; a tamping iron.
2. n. One who tamps; specifically, one who prepares for blasting, by filling the hole in which the charge is placed.
3. v. i. To meddle so as to alter, injure, or vitiate a thing.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.