What is "abreuvoir"

Abreuvoir \A`breu`voir"\, n. [F., a watering place.] (Masonry) The joint or interstice between stones, to be filled with mortar.
--Gwilt.

n. 1 (context obsolete Masonry English) The joint or interstice between stones, to be filled with mortar. 2 (context of humans English) A cold water drinking fountain typically found in a public location; also, a fountain or water source for animals (birds, horses etc).

An abreuvoir ( French: watering place, trough), can mean a basin containing water or a type of masonry joint.