“…the heavy bands still upon wrists and ankles, these, Cormac saw, sank deeply into the flesh which the rough and rusty metal envenomed.”

-The Temple of Abomination

1. en•ven•om

[ənˈvenəm]

VERB

envenoms (third person present) • envenomed (past tense) • envenomed (past participle) • envenoming (present participle)

1. archaic

to poison; make poisonous.

ORIGIN

Middle English (formerly also as invenom): from Old French envenimer, from en- ‘in’ + venim ‘venom

Literary Impressions of the Prose and Verse of Robert E. Howard

https://www.amazon.com/Well-Heroes-Literary-Impressions-Robert/dp/1546353844/ref=sr_1_1/139-6536987-6675238?s=books&ie=UTF8&qid=1493920079&sr=1-1