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(Botany) (of flowers, esp primulas) having the stigma on a short style below the anthers, which lie in the mouth of the corolla on big stamens. Compare pin-eyed
[C19: from thrum2, because of the ring of anthers visible at the neck of the corolla]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014