hyperarid
adjective
hy·per·ar·id
ˌhī-pər-ˈa-rəd
-ˈer-əd
variants
or hyper-arid
: 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
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Merriam-Webster unabridged
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