supermassive

adjective
su·​per·​mas·​sive | \ ˌsü-pər-ˈma-siv How to pronounce supermassive (audio) \

Definition of supermassive

: having a very large mass : extremely or extraordinarily massive a supermassive black hole

First Known Use of supermassive

1937, in the meaning defined above

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The first known use of supermassive was in 1937

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