Webster's Revised Unabridged Dictionary · 1913

Gustable

Gustable , adjective

[See Gust, v.]

1.
Capable of being tasted; tastable. [Obsolete]
This position informs us of a vulgar error, terming the gall bitter; whereas there is nothing gustable sweeter. — Harvey
2.
Pleasant to the taste; toothsome; savory.
A gustable thing, seen or smelt, excites the appetite, and affects the glands and parts of the mouth. — Derham

Gustable , noun

Anything that can be tasted. [Obsolete]