Definition - Adding emphasis by using two nouns plus a conjunction instead of a noun modified by an adjective.

Example -
Saying He slept despite his brain and anger instead of He slept despite his angry brain.

Etymology -
The word derives from the Greek phrase hen dia duoin, one thing by means of two.

Oxford English Dictionary -
Its first citation is from 1586:
"Hendiadis, when one thing of it selfe intire, is diversly laid open, as to say, On iron and bit he champt, for on the iron bit he champt."
(A. Day Eng. Secretary ii. (1625) 83)

Quotation -
"[hendiadys is] chiefly a poetic ornament in Greek and Latin, and little used in English; but nice and warm, try and do better, grace and favour, instead of nicely warm, try to do better, gracious favour, are true examples."
(Source: Fowler's Modern English Usage s.v. hendiadys )

Please comment