brainchild

or brain-child, brain child

[ breyn-chahyld ]
/ ˈbreɪnˌtʃaɪld /

noun, plural brain·chil·dren.

a product of one's creative work or thought.

Origin of brainchild

First recorded in 1880–85; brain + child
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for brainchild

brainchild

/ (ˈbreɪnˌtʃaɪld) /

noun plural -children

informal an idea or plan produced by creative thought; invention
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