A place or device containing or associated with: planetarium.
[Latin, neuter of -ārius, -ary.]
suffix forming nouns
indicating a place for or associated with something: aquarium; planetarium; solarium.
[from Latin -ārium, neuter of -ārius -ary]
a suffix occurring in nouns denoting an artificial environment for plants or animals, on the model of vivarium or herbarium: aquarium; terrarium. Compare -ary.
[< Latin -ārium; see -ary]