What is waning or diminished in some parts; not of uniform size throughout; -- said especially of sawed boards or timber when tapering or uneven, from being cut too near the outside of the log called?

wany — Waning or diminished in some parts; not of uniform size throughout; -- said especially of sawed boards or timber when tapering or uneven, from being cut too near the outside of the log. (Webster's 1913.)