The Collaborative International Dictionary of English v.0.48:

Procellarian \Pro`cel*la"ri*an\, n. [L. procella a storm.]
   (Zool.)
   One of a family of oceanic birds (Procellarid[ae])
   including the petrels, fulmars, and shearwaters. They are
   often seen in great abundance in stormy weather.
   [1913 Webster]