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Honorific alternative letter-case form of who, sometimes used when referring to God or another important figure who is understood from context. quotations examples
I make my pilgrimage to TheeO God, Who art the pilgrim's hope!Praised be the Virgin, sweet and pure!Be gracious to the pilgrimage.
2008, Music for Sight Singing, page 254
(fandom slang) The television show Doctor Who. quotations
After three event episodes in a row (the finale, Christmas special and season opener), “Tooth and Claw” is the first “regular” episode of Who we've had in a while.
2012, Graeme Burk, Robert Smith., Who Is the Doctor: The Unofficial Guide to Doctor Who, page 78
This is as wildly different to any episode of Who so far. It's fab.
2015, Ray Dexter, Doctor Who Episode By Episode: Volume 1 William Hartnell