This is the 6049th most frequent Spanish word.
acuario
Aquarium.
In this context, 'Acuario' is used as a proper noun to refer to one of the twelve astrological signs, specifically Aquarius.
Mi signo zodiacal es Acuario.
My zodiac sign is Aquarius.
Here, 'acuario' refers to a physical location, specifically a facility that houses aquatic animals for public viewing.
Fui al acuario para ver a los delfines.
I went to the aquarium to see the dolphins.
In this sentence, 'acuario' describes a container or tank used for keeping live fish or aquatic plants, typically at home.