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(now rare) An abnormal mass within the uterus; a false conception. [from 16th c.]
A poorly-conceived idea or plan. [from 17th c.]
A dreamer, someone absent-minded or distracted; a fool, simpleton. [from 17th c.]
From moon +"Ž calf, after a superstition that the moon caused abnormal fetal developement.
Earlier unformed embryo (from the supposed influence of the moon)
American Heritage Dictionary of the English Language, 5th Edition
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