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brainchild

or brain-child, brain child

[breyn-chahyld]
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noun, plural brain·chil·dren.
  1. a product of one's creative work or thought.
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Origin of brainchild

First recorded in 1880–85; brain + child
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for brain child

brainchild

noun plural -children
  1. informal an idea or plan produced by creative thought; invention
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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

Word Origin and History for brain child

n.

also brainchild, "idea, creation of one's own," 1881, from brain (n.) + child. Earlier was the more alliterative brain-brat (1630).

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Online Etymology Dictionary, © 2010 Douglas Harper