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Webster 1913 Edition

Noun.

[F., a furrow.]

(Fort.)

A work raised in the middle of a wide ditch, to defend it.

Crabb.

See also: sillón

sillon ‎(plural sillons)

(military, historical) A work raised in the middle of a wide ditch, to defend it.
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sillon m ‎(plural sillons)