Webster's Revised Unabridged Dictionary · 1913

nebule

nebule , noun

[Compare French nébule. See nebula.]

A little cloud; a cloud. [Obsolete]
O light without nebule. — Old Ballad

Nébulé , adjective

[French nébulé.]

(Heraldry) Composed of successive short curves supposed to resemble a cloud; -- said of a heraldic line by which an ordinary or subordinary may be bounded.

Also: Nebuly, Nebule