'Buckler' definitions:

Definition of 'buckler'

noun

Armor carried on the arm to intercept blows [syn: shield, buckler]

From: GCIDE

Buckler \Buc"kler\, v. t. To shield; to defend. [Obs.] [1913 Webster]
Can Oxford, that did ever fence the right, Now buckler falsehood with a pedigree? --Shak. [1913 Webster]

From: GCIDE

Buckler \Buc"kler\, n. [OE. bocler, OF. bocler, F. bouclier, a shield with a boss, from OF. bocle, boucle, boss. See Buckle, n.]
1. A kind of shield, of various shapes and sizes, worn on one of the arms (usually the left) for protecting the front of the body. [1913 Webster]
Note: 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. [1913 Webster]
2. (Zool.) (a) One of the large, bony, external plates found on many ganoid fishes. (b) The anterior segment of the shell of trilobites. [1913 Webster]
3. (Naut.) 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. [1913 Webster]
Blind buckler (Naut.), a solid buckler.
Buckler mustard (Bot.), a genus of plants (Biscutella) with small bright yellow flowers. The seed vessel on bursting resembles two bucklers or shields.
Buckler thorn, a plant with seed vessels shaped like a buckler. See Christ's thorn.
Riding buckler (Naut.), a buckler with a hole for the passage of a cable. [1913 Webster]

Buckler
A portable shield (2 Sam. 22:31; 1 Chr. 5:18).
A shield surrounding the person; the targe or round form; used once figuratively (Ps. 91:4).
A large shield protecting the whole body (Ps. 35:2; Ezek. 23:24; 26:8).
A lance or spear; improperly rendered "buckler" in the Authorized Version (1 Chr. 12:8), but correctly in the Revised Version "spear."
The leather of shields required oiling (2 Sam. 1:21; Isa. 21:5), so as to prevent its being injured by moisture. Copper (= "brass") shields were also in use (1 Sam. 17:6; 1 Kings 14:27). Those spoken of in 1 Kings 10:16, etc.; 14:26, were probably of massive metal.
The shields David had taken from his enemies were suspended in the temple as mementoes (2 Kings 11:10). (See ARMOUR, SHIELD.)