terrarium

noun

ter·​rar·​i·​um tə-ˈrer-ē-əm How to pronounce terrarium (audio)
plural terraria tə-ˈrer-ē-ə How to pronounce terrarium (audio) or terrariums
Synonyms of terrariumnext
: a usually transparent enclosure for keeping or raising plants or usually small animals (such as turtles) indoors

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A Terrarium at the Zoo

The turtle exhibit at a zoo is often in the form of a terrarium, as are some of the exhibits at a plant conservatory. In an ant terrarium, elementary-school students watch the ants dig their network of tunnels as if no one were watching. Terrariums try to create conditions as close as possible to a natural habitat. A covered terrarium can often sustain itself for months on the moisture trapped inside. But creating a good terrarium requires careful control not only of humidity but also of temperature, as well as good ventilation; the lighting should include the full spectrum of sunlight as well as a day-night regulator.

Examples of terrarium in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Choose terrarium plants that thrive in low sunlight, like ferns, certain succulents, and mosses. Steve Bender, Southern Living, 17 Apr. 2026 Artists used everything from traditional fishbowl terrariums to more sophisticated Wardian cases, which were used to support a myriad of tropical plants, including begonias, gesneriads, and specialty carnivorous plants, says bunting. Madeline Buiano, Martha Stewart, 9 Mar. 2026 Partnering with local artists, she’s already planned a crafting series, a terrarium workshop and more for the year ahead. Anya Sesay, jsonline.com, 6 Mar. 2026 Life advice Staying inside during the colder months can make your home feel like a little terrarium with its hot drinks and endless places to sit. Suzanne Nuyen, NPR, 11 Feb. 2026 See All Example Sentences for terrarium

Word History

Etymology

New Latin, from Latin terra + -arium (as in vivarium)

First Known Use

1890, in the meaning defined above

Time Traveler
The first known use of terrarium was in 1890

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Cite this Entry

“Terrarium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/terrarium. Accessed 26 Apr. 2026.

Kids Definition

terrarium

noun
ter·​rar·​i·​um tə-ˈrar-ē-əm How to pronounce terrarium (audio)
-ˈrer-
plural terraria
-ē-ə
or terrariums
: a transparent enclosure used for keeping and observing small animals and plants indoors
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