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mooncalf

[moon-kaf, -kahf] /ˈmunˌkæf, -ˌkɑf/
noun, plural mooncalves.
1.
a congenitally grossly deformed and mentally defective person.
2.
a foolish person.
3.
a person who spends time idly daydreaming.
Origin
1555-1565
1555-65; moon + calf1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for moon-calf

mooncalf

/ˈmuːnˌkɑːf/
noun (pl) -calves (-ˌkɑːvz)
1.
a born fool; dolt
2.
a person who idles time away
3.
(obsolete) a freak or monster
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for moon-calf
n.

also mooncalf, "abortive, shapeless, fleshy mass," 1560s, attributed to the influence of the moon; from moon (n.) + calf (n.). In later 16c., "deformed creature, monster."

Online Etymology Dictionary, © 2010 Douglas Harper
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