Wind egg

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an imperfect, unimpregnated, or addled egg.

See also: Wind

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
At about the time the Hebrews were completing the Torah, the Greeks were coining the phrase ourion oon 'wind egg,' to refer to certain eggs that do not hatch, presumedly because they are conceived by the wind.
The first actual wind-egg however appears in Aristophanes' Birds, 695, [Mathematical Expression Omitted] |black-winged Night first brought forth a wind egg'.(3) Not long after, stripped of its mythological qualities, the phrase is used frequently by Aristotle in his efforts to describe offspring conceived by the winds and borne by mares, hens, and vultures in the Historia animalium and the Generatione animalium.(4) For birds in particular the term
They are called "wind eggs" (which I presume is a technical term).