Webster's Dictionary 
(1): (n.) A small defense work at a salient angle; or a part of a parapet elevated to screen the other part from enfilade fire.
(2): (v. i.) To take off the bonnet or cap as a mark of respect; to uncover.
(3): (n.) A covering for the head, worn by women, usually protecting more or less the back and sides of the head, but no part of the forehead. The shape of the bonnet varies greatly at different times; formerly the front part projected, and spread outward, like the mouth of a funnel.
(4): (n.) Anything resembling a bonnet in shape or use
(5): (n.) An additional piece of canvas laced to the foot of a jib or foresail in moderate winds.
(6): (n.) A metallic canopy, or projection, over an opening, as a fireplace, or a cowl or hood to increase the draught of a chimney, etc.
(7): (n.) A frame of wire netting over a locomotive chimney, to prevent escape of sparks.
(8): (n.) A roofing over the cage of a mine, to protect its occupants from objects falling down the shaft.
(9): (n.) In pumps, a metal covering for the openings in the valve chambers.
(10): (n.) A headdress for men and boys; a cap.
(11): (n.) A soft, elastic, very durable cap, made of thick, seamless woolen stuff, and worn by men in Scotland.
(12): (n.) The second stomach of a ruminating animal.
(13): (n.) An accomplice of a gambler, auctioneer, etc., who entices others to bet or to bid; a decoy.
(14): (n.) The metal cover or shield over the motor.
Hastings' Dictionary of the Bible 
Bonnet . With the exception of Isaiah 3:20 , this is the AV [Note: Authorized Version.] designation of the special headdress of the rank and file of the priesthood according to the priestly writer ( Exodus 28:40; Exodus 29:9 etc., RV [Note: Revised Version.] head-tire ). It consisted of a long swathe of fine white linen wound round the head note Exodus 29:9 RV [Note: Revised Version.] ‘bind ( or wind) head-tires’ to form an egg-shaped turban. Cf. Jos. [Note: Josephus.] Ant . III. vii. 3; and Rich, Dict. Rom. and Gr. Ant. s.v. ‘pileus’ for illust. of the egg-shaped cap of Ulysses, with which Jerome compares the priestly turban. See Dress, 5, Mitre.
A. R. S. Kennedy.
Watson's Biblical & Theological Dictionary 
was a covering for the head, worn by the Jewish priests. Josephus says, that the bonnet worn by the private priests was composed of several rounds of linen cloth, turned in and sewed together, so as to appear like a thick linen crown. The whole was entirely covered with another piece of linen, which came down as low as their forehead, and concealed the deformity of the seams. See Exodus 28:40 . The high priest's bonnet was not much different from that which has been described.
Easton's Bible Dictionary 
Exodus 39:28 Ezekiel 44:18 Isaiah 3:20 Isaiah 61:10 Ezekiel 24:17,23 Exodus 28:40 29:9Mitre
Morrish Bible Dictionary 
Covering for the head of men as well as women. Exodus 28:40; Exodus 29:9; Exodus 39:28; Isaiah 3:20; Ezekiel 44:18 .
Holman Bible Dictionary 
Exodus 28:40 Exodus 29:9 Exodus 39:28 Leviticus 8:13Clothing Cloth
International Standard Bible Encyclopedia 
bon´et : In the King James Version the designation of the special headdress of the rank and file of the priesthood, the Revised Version (British and American) "head-tire" ( Exodus 28:40 ). It consisted of a long swath of fine white linen wound around the head in oriental fashion. The Hebrew word found in Exodus 29:9 the Revised Version (British and American), "to bind head-tires," literally "to wind head-tires," means, in the light of usage, "to form an egg-shaped turban." Compare Josephus, Ant , III, vii, 3; and see Rich, Dict. Roman and Greek Ant , under the word pileus , for illustration of the egg-shaped cap of Ulysses, with which Jerome compared the priestly turban. See Dress; Mitre , etc.