a cavern; cave.
Note the antithesis in the same line, antre de rois, Louvre de voleurs.
La Lgende des Sicles Victor Hugo
antre is a generic term for cave, and as trou means hole, the word antrou is also equivalent to old hole.
Archaic England Harold Bayley
(archaic) a cavern or cave
antrectomy antrectomy an·trec·to·my (ān-trěk’tə-mē) n. Excision of an antrum, such as removing the pyloric antrum of the stomach.
a cavern; cave. Historical Examples He took up the Zoology of Pliny, and pursued his accounts of “antres vast, and men whose heads do grow beneath their shoulders.” Olla Podrida Frederick Marryat (AKA Captain Marryat) noun (archaic) a cavern or cave
a county in NE Northern Ireland. 1098 sq. mi. (2844 sq. km). County seat: Belfast. an administrative district in this county. 217 sq. mi. (563 sq. km). Contemporary Examples Taylor Antrim Everything Ravaged, Everything Burned, by Wells Tower. Our Favorite Books of 2009 The Daily Beast December 21, 2009 Antrim sketches his characters—Rotarians, tennis buﬀs, […]
antro- antro- pref. Antrum: antroscope.