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"poison" is also used as a crossword clue. If that's what you saw, the answer is often venom (5 letters).
Definitions
administer poison to
Word origin
From Middle English poysoun, poyson, pusoun, from Old French poison, poisun, from Latin pōtiōnem (“drink, a draught, a poisonous draught, a potion”), from pōtō (“to drink”). See also potion and potable (from the same root). Mostly displaced native Old English ātor. See more at atter.
Used in a sentence
“Near-synonym: (loosely) venom”
“We used a poison to kill the weeds.”
“Gossip is a malicious poison.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Toxic substance”6 letters
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