GalahadPronunciation: /ˈgaləhad/ (also Sir Galahad)Definition of Galahad the noblest of King Arthur’s knights, renowned for immaculate purity and destined to find the Holy Grail. (as noun a (Sir) Galahad) a person characterized by nobility, integrity, or courtesy: the wise guys and Sir Galahads, they don’t lastGalahad in other Oxford dictionaries Definition of Galahad in the US English dictionary