"resembling or of the nature of an antidote," 1640s, from antidote + -al (1). Related: Antidotally.
Entries linking to antidotal
antidote n.
"remedy counteracting poison," early 15c. (c. 1400 as antidotum), from Old French antidot and directly from Latin antidotum/antidotus "a remedy against poison," from Greek antidoton (pharmakon) "(drug) given as a remedy," from antidoton literally "given against," verbal adjective of antididonai "give for" (also "give in return, give instead of") from anti "against" (see anti-) + didonai "to give" (from PIE root *do- "to give"). Compare Middle English antidotarie "treatise on drugs or medicines" (c. 1400).
-al 1
suffix forming adjectives from nouns or other adjectives, "of, like, related to, pertaining to," Middle English -al, -el, from French or directly from Latin -alis (see -al (2)).