say it: BRAYN-chahyld
brainchild is a noun meaning "a product of your creative thinking and work". It carries one recorded sense.
a product of your creative thinking and work
“he had little respect for the inspirations of other artists”
“after years of work his brainchild was a tangible reality”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for brainchild come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.