Archaic or dialectal spelling of 'know,' appearing in very old English texts.
From Old English cnawan, a variant spelling of 'know.' This form appears in Middle English and earlier texts.
Gnow is a ghost of English spelling before standardization—if you look at the King James Bible or Chaucer, you'll see wild variations in spelling because nobody agreed on the right way to write words yet.
Complete word intelligence in one call. Free tier — 50 lookups/day.