All 3 Uses of

domestic
in
Wuthering Heights

'Here we have the whole establishment of domestics, I suppose,' was the reflection suggested by this compound order.†
p. 1.8 *

I began to doubt whether he were a servant or not: his dress and speech were both rude, entirely devoid of the superiority observable in Mr. and Mrs. Heathcliff; his thick brown curls were rough and uncultivated, his whiskers encroached bearishly over his cheeks, and his hands were embrowned like those of a common labourer: still his bearing was free, almost haughty, and he showed none of a domestic's assiduity in attending on the lady of the house.†
p. 7.6

This is not much connected with Miss Isabella's affair: except that it urged me to resolve further on mounting vigilant guard, and doing my utmost to cheek the spread of such bad influence at the Grange: even though I should wake a domestic storm, by thwarting Mrs. Linton's pleasure.†
p. 80.4

Definitions:

(1) (domestic as in: the domestic market)
relating to a home country

or (much more rarely,): relating to a geographic area that is smaller than a country
(2) (domestic as in: domestic happiness)
relating to a home or family
(3) (domestic animal as in: a domestic animal like a dog)
referring to animals kept as pets or for ranching
(4) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

Domestics refers to a household servants. (Rarely, domestic refers to a single household servant.)