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The Collaborative International Dictionary
trapholes

Trou-de-loup \Trou"-de-loup"\, n.; pl. Trous-de-loup. [F. trou hole + de of + loup wolf.] (Mil.) A pit in the form of an inverted cone or pyramid, constructed as an obstacle to the approach of an enemy, and having a pointed stake in the middle. The pits are called also trapholes.

Wiktionary
trapholes

n. (plural of traphole English)