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Webster 1913 Edition

Noun.

[F.

hérisson

, prop., hedgehog.]

(fort.)

A beam or bar armed with iron spikes, and turning on a pivot; – used to block up a passage.

Noun.

In fortification, a beam or bar armed with iron spikes pointing outwards, and a turning on a pivot; used to block up a passage.

See also: hérisson

herisson ‎(plural herissons)

A beam or bar armed with iron spikes, and turning on a pivot, used to block up a passage.
(heraldry) A hedgehog.