What is Boilary?

Legal Definition
A term used to denote the water which arises from a salt well, belonging to one who has no right to the soil. Ejectment may be maintained for it. 2 Hill, Ab. c. 14, §5; Co. Litt. 4 b.
-- Bouviers Law Dictionary
Legal Definition
Water arising from a salt well belonging to a person who is not the owner of the soil.
-- Black's Law Dictionary