[poi.son] n [ME, fr. MF, drink, poisonous drink, poison, fr. L potion-, potio drink--more at potion] (13c) 1 a: a substance that through its chemical action usu. kills, injures, or impairs an organism b (1): something destructive or harmful (2): an object of aversion or abhorrence
2: a substance that inhibits the activity of another substance or the course of a reaction or process "a catalyst ~"
[2]poison vt poi.soned ; poi.son.ing (14c) 1 a: to injure or kill with poison b: to treat, taint, or impregnate with or as if with poison
2: to exert a baneful influence on: corrupt "~ed their minds"
3: to inhibit the activity, course, or occurrence of -- poi.son.er n [3]poison adj (1530) 1: poisonous, venomous "a ~ plant" "a ~ tongue"
2: impregnated with poison: poisoned "a ~ arrow"