This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Plural form of den.

n. In anatomy and dentistry, a tooth.

n. In anatomy and zoology, a tooth-like or dentate part or organ. See tooth.

n. The incus or anvil, one of the little bones of the ear, so called from its shape in man.

n. In entomology, the terminal point of a mandible.

"But it would be criminal for the State, at its expense, i. e., at the expense of the entire population, to maintain dens for the smoking of opium and to hire special persons to minister to the needs of the frequenters of these places."

denned    denning    dens   

room    hiding place    habitation    unit    social unit   

to den up   

denning    denned   

haunt    ravine    dell    Wiktionary appendix of animal terms    including their homes    lair   

Adrienne    Amen    Ben    Cayenne    Chen    Cheyenne    Gen    Glen    Glenn    Gwen   

cave    apartment    dungeon    pit    lair    bedroom    hut    hall    haunt    nest