Webster's Revised Unabridged Dictionary · 1913

Jenny

Jenny , noun

1.
A familiar or pet form of the proper name Jane.
2.
(Zoology) A familiar name of the European wren.
Collocations (1)
Jenny ass (Zoology) , a female ass; also, a female of certain other animals.

Jenny , noun

[A corruption of gin an engine; influenced by Jenny, the proper name. See Gin an engine, and compare Ginny-carriage.]

A machine for spinning a number of threads at once, -- used in factories. Also called spinning jenny.