Comparative form of billowy; more inclined to billow or characterized by larger waves and surges.
From 'billowy' plus the comparative suffix '-er,' itself from 'billow' (Old Norse 'bylgja') plus '-y' (indicating a quality), then '-er' for comparison.
Billowier belongs to a special category of comparative adjectives from nautical vocabulary—words like 'rougher' and 'choppier' that only sailors really need to compare precisely.
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