Opus incertum

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Related to incertum opus: Opus quadratum, Opus mixtum
(Anc. Arch.) a kind of masonry employed in building walls, in which the stones were not squared nor laid in courses; rubblework.
(Arch.) See under Incertum.

See also: Incertum, Opus

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.