I don't know why I am venturing into this
etymological mine-field, but here goes:
The Oxford English Dictionary (which, however
quaint it may be, I still use as an authority) uses only "cirrho-" for the
prefix deriving from the Greek for orange or yellow, and "cirro-"
(annotated "Erroneouly 'cirrho-'") relating to "cirrus" derived from the Latin
for a curl-like tuft or fringe, as in the cloud form.
So there you are. Relevance to birds?
They fly through cirrus clouds.
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