Tank (liquid)
A tank was a large container of liquid.

In 2152, Doctor Phlox and Captain Jonathan Archer used a tank to super-hydrate Archer's pet dog Porthos, while the dog was undergoing surgery to replace his pituitary gland. () Phlox also kept a Lyssarian Desert Larvae in a tank inside sickbay aboard . ()

In the Xindi Council chamber on the Xindi Council planet, the Xindi-Aquatics were contained in a large tank. (, et al.)

The Hirogen had tanks in their trophy rooms aboard their warships. According to tricorder readings by Commander Chakotay in 2374, these tanks included some sort of enzyme which breaks down bones, muscle tissue, and meat from different species. Tuvok speculated it could be a method to denaturate their prey while Chakotay assumed it could be their dinner. ()

Types 
 Aquarium
 Birthing tank
 Growth tank

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Medical equipment