bondstone

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bondstone

(ˈbɒndˌstəʊn)
n
(Building) a long stone or brick laid in a wall as a header. Also called: bonder

bond•stone

(ˈbɒndˌstoʊn)

n.
a stone, as a perpend, for bonding facing masonry to a masonry backing.
[1835–45]