1. a glass container in which plants are grown
2. a glass enclosure for keeping small land animals

Examples

• She built a terrarium with ferns and moss.
• The science class made terrariums using old fish tanks.
• His desk terrarium contained tiny succulents.
• The pet store sold terrariums for hermit crabs.
• We observed the water cycle in our classroom terrarium.
• The terrarium created a miniature ecosystem.
• She kept her gecko in a large terrarium.