Real instances of hendiadys are much rarer than is generally supposed.
A hendiadys for 'Go drink all the mind-purging hellebore that grows in Anticyra'.
This line is a type of hendiadys, the first half of the line being redefined by the second.
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 in their writings, but it is frequent among Latin writers.