Use of two conjoined nouns instead of a noun and modifier

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Hendiadys \Hen*di"a*dys\, n. [NL., fr. Gr. ? ? ? one by two.] (Gram.) A figure in which the idea is expressed by two nouns connected by and, instead of by a noun and limiting adjective; as, we drink from cups and gold, for golden cups.

Wiktionary Word definitions in Wiktionary
n. (context rhetoric English) a figure of speech used for emphasis, where two words joined by ''and'' are used to express a single complex idea.

Wikipedia Word definitions in Wikipedia
Hendiadys (; a Latinized form of the Greek phrase ἓν διὰ δυοῖν, hèn dià duoîn , "one through two") is a figure of speech used for emphasis — "The substitution of a conjunction for a subordination". The basic idea is to use two words linked by the conjunction ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1580s, figure of speech in which two nouns joined by and are used in place of a noun and an adjective; from Medieval Latin alteration of Greek hen dia duoin "one (thing) by means of two." If this term was used by Greek grammarians it is no longer found ...

WordNet Word definitions in WordNet
n. use of two conjoined nouns instead of a noun and modifier