Definitions from Wiktionary (Buckler)

▸ noun:  One who buckles something.
▸ noun:  A kind of shield, of various shapes and sizes, held in the hand or worn on the arm (usually the left), for protecting the front of the body. In the sword and buckler play of the Middle Ages in England, the buckler was a small shield, used not to cover the body but to stop or parry blows.
▸ noun:  (obsolete) A shield resembling the Roman scutum. In modern usage, a smaller variety of shield is usually implied by this term.
▸ noun:  (zoology) One of the large, bony, external plates found on many ganoid fishes.
▸ noun:  (zoology) The anterior segment of the shell of a trilobite.
▸ noun:  (nautical) A block of wood or plate of iron made to fit a hawse hole, or the circular opening in a half-port, to prevent water from entering when the vessel pitches.
▸ verb:  (transitive, obsolete) To shield; to defend.
▸ noun:  A surname.

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