We have no meanings for "billowy masses" in our records yet.
1 Far on the horizon they could make out great billowy masses of white cloud.
2 Usually the clouds are of the cumulus variety and roll leisurely by in billowy masses .
3 Just then another steamer entered the harbour, an enormous leviathan from whose funnels smoke poured in billowy masses .
4 It blew out of the canyon-mouth like a gust from a chimney, rolling over and over in billowy masses .
5 The horses at once ran away and hid themselves in the clouds, which hung down from the mountains in soft billowy masses .
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