The microgravity lab was a section aboard a Vissian starship.

In 2153, Calla headed up the microgravity lab on Drennik's starship, a position which didn't give her time for cooking. (ENT: "Cogenitor")

A microgravity lab, according to the Star Trek Encyclopedia (4th ed., vol. 2, p. 40), was a "scientific facility used to study the effects of the extremely low levels of gravity encountered in space."
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