1. To adulterate the purity of.
2. To make impure in a figurative sense.
3. To make radioactive by adding radioactive material.

1. To communicate a disease to
2. To contaminate with a disease or microorganism; SYN. taint

ETYM French teint, p. p. of teindre to dye, tinge, from Latin tingere, tinctum. Related to Tinge, Tint.
To contaminate; to make impure.