Able to be substituted, exchanged, or removed and restored with something new or different.
From 'replace' (re- 'again' + place 'to put') plus '-able' (capable of). The word emerged in the 18th century with industrial manufacturing.
In nature, some body parts are replaceable (like starfish arms or gecko tails) while humans can regrow some things like liver tissue—it's one of the coolest differences between species!
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