Any Substance That Is Poisonous to a Cell

This page is the CodyCross answer for the clue below from Futuristic City , Group 986, Puzzle 4 (Life Extension).

Question is: Any Substance That Is Poisonous to a Cell

and the answer is: CYTOTOXIN

Word Meaning:

CYTOTOXIN — (cytology) Any substance having a specific toxic effect on certain cells.

Definitions from Wiktionary.