any of various plants having leaves that tend to lie in a plane at right angles to the strongest light, hence usually north and south, especially Silphium laciniatum.
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Origin of compass plant
First recorded in 1840–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for compass plant
Also called: rosinweed a tall plant, Silphium laciniatum, of central North America, that has yellow flowers and lower leaves that tend to align themselves at right angles to the strongest light, esp in a north-south plane: family Asteraceae (composites)
any of several similar plants
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