Tamper \Tamp"er\, n.

1. One who tamps; specifically, one who prepares for blasting, by filling the hole in which the charge is placed.

2. An instrument used in tamping; a tamping iron.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Tamper \Tam"per\, v. i. [imp. & p. p. Tampered; p. pr. & vb. n. Tampering.]

[A corruption of temper.]

1. To meddle; to be busy; to try little experiments; as, to tamper with a disease.

'T is dangerous tampering with a muse. --Roscommon.

2. To meddle so as to alter, injure, or vitiate a thing.

3. To deal unfairly; to practice secretly; to use bribery.

Others tampered For Fleetwood, Desborough, and Lambert. --Hudibras.

Source: Webster's Revised Unabridged Dictionary (1913)