All 7 Uses

laboratory
in
Frankenstein, by Mary Shelley
(Edited)

He then took me into his laboratory and explained to me the uses of his various machines, instructing me as to what I ought to procure and promising me the use of his own when I should have advanced far enough in the science not to derange their mechanism.
p. 50.8 *

laboratory = workplace for scientific or medical research
My application was at first fluctuating and uncertain; it gained strength as I proceeded and soon became so ardent and eager that the stars often disappeared in the light of morning whilst I was yet engaged in my laboratory.
p. 51.6
He had also changed my apartment; for he perceived that I had acquired a dislike for the room which had previously been my laboratory.
p. 69.1
Soon after my arrival in the hovel I discovered some papers in the pocket of the dress which I had taken from your laboratory.
p. 132.7
Sometimes I could not prevail on myself to enter my laboratory for several days, and at other times I toiled day and night in order to complete my work.
p. 169.3
I sat one evening in my laboratory; the sun had set, and the moon was just rising from the sea; I had not sufficient light for my employment, and I remained idle, in a pause of consideration of whether I should leave my labour for the night or hasten its conclusion by an unremitting attention to it.
p. 170.1
The next morning, at daybreak, I summoned sufficient courage and unlocked the door of my laboratory.
p. 175.1

Definitions:

(1) (laboratory)
a workplace where people do scientific or medical research, or produce drugs or chemicals

or (as an adjective): related to such a place
(2) (meaning too rare to warrant focus)
Much more rarely, lab can be used as an abbreviated way of saying Labrador retriever. It is also a rare last name and may indicate someone's initials.