Hail-fellow n. : An intimate companion.

Example:


Taxonomy
Hail, OED, free encyclopedia, quotation, orphan, English idiom, pejorative, TheFreeDictionary, English language, Friendship, Oxford English Dictionary, Personality psychology, search, articles link, archaic English, The Oxford English Dictionary, 1500s, friendliness.

Defination from the web:
... The OED also gives quotations for the related phrase "hail fellow", a greeting that apparently dates to medieval times. ...