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countable and uncountable, plural alations
(uncountable) The state of being winged. examples
(countable) A wing or wing-like structure. quotations examples
Sculpture of strong wing-like structures or alations, initiated first below the smooth nuclear whorls as broad and somewhat flattened axial ridges, which on the sixth whorl become slightly oblique and expanded […]
1940, Woods Hole Oceanographic Institution, Collected Reprints, page 117