οἴκημαoíkēma, oy'-kay-mah; from G3611; a tenement, i.e. (specially), a jail:—prison.
Thayer's Greek Lexicon
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STRONGS G3612:
οἴκημα, ὀικηματος, τό, from (Pindar and) Herodotus down, a dwelling-place, habitation; euphemistically a prison (R. V.cell), Acts 12:7, as in Thucydides 4, 47f; Demosthenes, Lucian, Tox. 29; Plutarch, Agis 19; Aelian v. h. 6, 1.