a law regulating the sale of securities, real estate, etc., especially such a law designed to prevent the promotion of fraudulent stocks.
Origin of blue-sky law
An Americanism dating back to 1910–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
US a state law regulating the trading of securities: intended to protect investors from fraud
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