Did you mayhaps mean one of these? apparatus, asparagus, aspirates, saleratus
Definitions
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Examples
“The society has already scored one skybreaking success - the discovery of the first new form of cloud in half a century, dubbed "asperatus" after the Latin for "making rough", because it is supposed to look like a sea surface on a stormy day.”
Telegraph.co.uk - Telegraph online, Daily Telegraph and Sunday Telegraph
“VIEW FAVORITES yahooBuzzArticleHeadline = 'Armageddon with scattered undulatus asperatus By Mike Olson'; yahooBuzzArticleSummary = 'In hill country from Iowa to the Scottish Highlands, sky-gazers have reported some strange, ominous-looking clouds of late.”
OpEdNews - Quicklink: Armageddon with scattered undulatus asperatus By Mike Olson
“If it makes the cut, asperatus will be the first new addition in more than 50 years. ”
OpEdNews - Quicklink: Armageddon with scattered undulatus asperatus By Mike Olson
“If it makes the cut, asperatus will be the first new addition in more than 50 years.”
OpEdNews - Quicklink: Armageddon with scattered undulatus asperatus By Mike Olson
“Armageddon with scattered undulatus asperatus By Mike Olson”
OpEdNews - Quicklink: Armageddon with scattered undulatus asperatus By Mike Olson
“Dubbed undulatus asperatus (turbulent undulation), the atmospheric anomaly could be headed where only 80-odd clouds have gone before: into the International Cloud Atlas.”
OpEdNews - Quicklink: Armageddon with scattered undulatus asperatus By Mike Olson
“The Royal Meteorological Society is now gathering detailed information for the days and locations where the asperatus clouds have been seen in an attempt to understand exactly what is causing them.”
Meteorologists Attempting To Have ‘Asperatus’ Clouds Officially Named | Impact Lab
“He proposes they be called altocumulus undulatus asperatus.”
“Among the worldwide locations where asperatus clouds have been spotted are above the flat plains of Iowa and Australia and also over the arctic sea just off the coast of Greenland.”
“OpEdNews - Quicklink: Armageddon with scattered undulatus asperatus By Mike Olson”
OpEdNews - Quicklink: Armageddon with scattered undulatus asperatus By Mike Olson
Lists
These user-created lists contain the word ‘asperatus’.
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Clouds
We owe our current names for clouds to Luke Howard. Wikipedia tells us that "Howard was not the first to attempt a classification of clouds—Jean-Baptiste Lamarck (1744–1829) had earlier proposed a ...
wane-cloud, stratus, cirrostratus, cirro-stratus, strato-cirrus, altostratus, salmon-cloud, cumulus, altocumulus lenti..., sonder-cloud, rain-cloud, nimbostratus and 205 more...
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weather terms
thunderhead, nebula, cyclone, anticyclone, mammatus, mauzy, inclement, fair, anvil, misty, drizzle, overcast and 19 more...
Tweets
Looking for tweets for asperatus.

ruzuzu That's really cool. I'm sure Luke Howard would have approved. Aug 29, 2010
bilby Proposed name - full moniker undulatus asperatus - for a 'new' cloud. See here and here. Aug 29, 2010