Definitions

from The Century Dictionary.

  • noun In fortification, a work raised in the middle of a ditch, to defend it when it is too wide: frequently called an envelop.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Fort.) A work raised in the middle of a wide ditch, to defend it.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun military, historical A work raised in the middle of a wide ditch, to defend it.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

French sillon ("furrow").

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