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The largest and lowest pitched of the double-reed wind instruments, sounding an octave below the bassoon. Also called double bassoon.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Instruments) the largest instrument in the oboe family, pitched an octave below the bassoon; double bassoon
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
con•tra•bas•soon(ˈkɒn trə bæˈsun, -bə-)
a bassoon larger in size and an octave lower in pitch than the ordinary bassoon; a double bassoon.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.