Use the adjective modular to describe something that is made up of pieces or parts, like a gerbil's habitat of tubes and cages, or a new house that is delivered in sections and then assembled.

Things like houses, cars, airplanes, and computers are all often constructed in a modular way. Rather than being built all at once, they are built in separate parts that get assembled into a finished product. The word modular has been used this way since the 1930s — earlier, it was a purely mathematical term, from the Latin word modulus, or "small measure."

Definitions of modular

adj constructed with standardized units or dimensions allowing flexibility and variety in use

modular furniture”
modular homes”
conforming to or constituting a standard of measurement or value; or of the usual or regularized or accepted kind

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