Poison 03 : (1) A substance that causes serious tissue damage or death when taken in small doses. (2) A material which absorbs neutrons, thus decreasing the reactivity in a nuclear reactor; boron is often used
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}