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British Dictionary definitions for bats-in-the-belfry

bats-in-the-belfry

noun (functioning as singular)
  1. a hairy Eurasian campanulaceous plant, Campanula trachelium, with bell-shaped blue-purple flowers
adjective
  1. slang mad; demented
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