hyperarid

adjective
hy·per·ar·id | \ ˌhī-pər-ˈa-rəd , -ˈer-əd \
variants: or hyper-arid

Definition of hyperarid 

: extremely arid hyperarid desert regions hyperarid climates …Antarctica's hyperarid, cold-desert conditions make it this planet's closest analogue to Mars … —Jean Hennelly Keith

First Known Use of hyperarid

1960, in the meaning defined above

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The first known use of hyperarid was in 1960

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