ultrarare

adjective
ul·​tra·​rare | \ ˌəl-trə-ˈrer How to pronounce ultrarare (audio) \
variants: or ultra-rare

Definition of ultrarare

: extremely rare or uncommon ultra-rare diseases an ultrarare baseball card reunited the band for an ultrarare appearance The ultrarare Highland Scotch has been called the "crowning glory" in the … collection and comes in a hand-blown bottle, individually numbered in wax.— Mia Stainsby

First Known Use of ultrarare

1822, in the meaning defined above

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The first known use of ultrarare was in 1822

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