Definition of barometer bush
: a compact evergreen shrub (Leucophyllum frutescens of the family Scrophulariaceae) native to Texas and adjacent northern Mexico that has grayish-green hairy leaves and solitary, bell-shaped, usually pink or purple flowers
- Hope bloomed on those hardy plants, known to old-timers as barometer bushes because showers trigger their flowers.
- —Tracy Hobson Lehmann, San Antonio Express-News, 9 July 2011
