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.
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Or an ungrouted bathroom wall that if… Actually, I suppose DIY already is like that – if you don’t fix the dripping pipe or leaky roof now, the problem becomes bigger.
From The Guardian ● Oct. 11, 2014