grout
noun
a thin, coarse mortar poured into various narrow cavities, as masonry joints or rock fissures, to fill them and consolidate the adjoining objects into a solid mass.
Used to describe an ongoing action or state that is currently taking place in the immediate present.
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Another method, which has rather fallen into disuse, is grouting.
From Scientific American Supplement, No. 601, July 9, 1887 by Various