What does aquarium mean?
An aquarium is a container—typically a glass or acrylic tank—filled with water and used to house fish, invertebrates, plants, and other aquatic life, whether as a domestic hobby or as part of a large public exhibition. The term also denotes the institutions themselves: public aquariums display everything from local freshwater species to sharks, jellyfish, and coral reefs, often combining entertainment with education and marine conservation. The word entered English in the mid-nineteenth century, derived from Latin aquarius, meaning 'of water', and quickly became fashionable during the Victorian era, when home fish-keeping became a widespread pastime. Today the word is entirely neutral in tone and universally understood across the English-speaking world. Hobbyists distinguish between freshwater and marine (saltwater) aquariums, and terms like reef tank and nano aquarium describe specialized variants. Both plural forms, aquariums and aquaria, remain in current use.
A transparent tank filled with water in which fish and other aquatic animals and plants are kept and displayed.
"He cleaned the algae from the sides of his home aquarium before adding the new tetras."
A public building or institution where collections of live aquatic animals are kept and exhibited to visitors.
"On our school trip we visited the national aquarium to see the dolphin exhibit."
Both plurals are standard: 'aquariums' is the everyday form, especially in American English, while the Latinate 'aquaria' appears more often in formal, scientific, or institutional contexts.
"The society maintains several aquaria for its research on coral species."
The word 'aquarium' was popularized in Victorian Britain in the 1850s, when keeping fish at home became such a craze that it was called 'aquariamania'.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of aquarium
The word aquarium derives from the Latin aquarius, meaning 'pertaining to water', itself formed from aqua, the Latin word for water. It was adopted into English in the mid-nineteenth century, around the 1850s, when the keeping of aquatic plants and animals in glass tanks became a popular Victorian pursuit. The same Latin root gives English a family of related words including aquatic, aqueduct, aquamarine, and aquifer, all sharing the sense of connection to water.
How aquarium is actually used
Both plural forms 'aquariums' and 'aquaria' are accepted; 'aquaria' is more common in formal or scientific writing, while 'aquariums' predominates in everyday American usage. The word carries neutral to positive connotations, associated with hobby, education, and conservation.
Easily confused with aquarium
Aquatic is an adjective describing things that live or grow in water, whereas aquarium is a noun referring to the tank itself or the facility housing aquatic life.