Definition of Bulwark

Babylon English Dictionary
stout defense wall, fortress wall
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Bulwark Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(v. t.)
To fortify with, or as with, a rampart or wall; to secure by fortification; to protect.
  
(n.)
The sides of a ship above the upper deck.
  
(n.)
That which secures against an enemy, or defends from attack; any means of defense or protection.
  
(n.)
A rampart; a fortification; a bastion or outwork.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
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bulwark
\bul"wark\, v. t. [imp. & p. p. bulwarked (&?;); p. pr. & vb.n. bulwarking.] to fortify with, or as with, a rampart or wall; to secure by fortification; to protect. of some proud city, bulwarked round and armed with rising towers.
bulwark
\bul"wark\ (&?;), n. [akin to d. bolwerk, g. bollwerk, sw. bolwerk, dan. bolv?rk, bulv?rk, rampart; akin to g. bohle plank, and werk work, defense. see bole stem, and work, n., and cf. boulevard.]
1. (fort.) a rampart; a fortification; a bastion or outwork.
2. that which secures against an enemy, or defends from attack; any means of defense or protection. the royal navy of england hath ever been its greatest defense, the floating bulwark of our island.
3. pl. (naut.) the sides of a ship above the upper deck.

for Vocabulary Exams of KPDS, YDS,UDS (in Turkey); and SAT in America
Anything that gives security or defense.
JM Welsh <=> English Dictionary
Trusiad = n. a ward, a bulwark
Ysgor = n. a rampart, a bulwark
GLOSSARY OF ESOTERIC WORDS
A solid structure or wall raised for defense. In nautical terms, it's a breakwater or the part of a ship's side above the upper deck provided with a gangplank for passengers to board. By extension, a bulwark is anything that protects one from danger or unpleasantness.
usage note:"Barricade," "breastwork" and "earthwork" are other terms for defensive structures. A bulwark refers to the sturdiest of the all. A "barricade" is a hasty construction to deter an immediate threat; "breastwork" refers to a low temporary wall hurriedly built and "earthwork" means a pile of dirt.
WordNet 2.0

Noun
1. an embankment built around a space for defensive purposes; "they stormed the ramparts of the city"; "they blew the trumpet and the walls came tumbling down"
(synonym) rampart, wall
(hypernym) embankment
(hyponym) Antonine Wall
(part-holonym) fortification, munition
2. a fence-like structure around a deck
(synonym) bulwarks
(hypernym) barrier
(part-holonym) ship
3. a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away
(synonym) breakwater, groin, groyne, mole, seawall, jetty
(hypernym) barrier

Verb
1. defend with a bulwark
(hypernym) defend
(derivation) rampart, wall
Bulwark Definition from Government Dictionaries & Glossaries
UK Post Codes and Counties
County:  Aberdeenshire
Post Code: AB42
Bulwark Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
A bastion is an angular structure projecting outward from the curtain wall of an artillery fortification. The fully developed bastion consists of two faces and two flanks with fire from the flanks being able to protect the curtain wall and also the adjacent bastions. It is one element in the style of fortification dominant from the mid 16th to mid 19th centuries. Bastion fortifications offered a greater degree of passive resistance and more scope for ranged defense in the age of gunpowder artillery compared with the medieval fortifications they replaced.

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Bulwark Definition from Sports Dictionaries & Glossaries
maritime&shipping&trade
A parapet, or extension of the hull planking above the weather deck, and carried round the vessel providing protection from weather.