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Bondstone
The Century Dictionary and Cyclopedia
noun.
Same as
bonder
, 2.
the GNU version of the Collaborative International Dictionary of English
noun.
A stone running through a wall from one face to another, to bind it together; a binding stone.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
A
stone
for
bonding
masonry
to a similar backing.