knight

noun

• A young servant or follower; a trained military attendant in service of a lord.
• A minor nobleman with an honourable military rank who had served as a page and squire.
• (by extension) An armored and mounted warrior of the Middle Ages.

  "King Arthur and the Knights of the Round Table"

• (modern) A person on whom a knighthood has been conferred by a monarch.
• A brave, chivalrous and honorable man devoted to a noble cause or love interest.
• A chess piece, often in the shape of a horse's head, that is moved two squares in one direction and one at right angles to that direction in a single move, leaping over any intervening pieces.
• A playing card bearing the figure of a knight; the knave or jack.
• Any of various nymphalid butterflies of the genus Ypthima.
• (modern) A generic name for various mushrooms belonging to the fungal order gilled mushrooms; scientific name Tricholoma.