Hawker's Poor Man's Concordance And Dictionary
(See Joshua 13:4) It should seem to have been a cavern, or cave, as Mahar, a cavern.
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Hawker, Robert D.D. Entry for 'Mearah'. Hawker's Poor Man's Concordance and Dictionary. https://www.studylight.org/dictionaries/eng/pmd/m/mearah.html. London. 1828.