Plural of arboretum (alternative plural form); places with collections of different tree species for study and public display.
English plural form of the Latin word arboretum, using the English -s ending. Latin arboretum itself comes from arbor (tree) + -etum (place where something grows).
English speakers sometimes use both 'arboreta' (the Latin plural) and 'arboretums' (the English plural)—and both are correct, making this one of those happy cases where you can choose which language tradition you follow.
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