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Arranged in two vertical rows on opposite sides of an axis: distichous leaves.
[From Latin distichus, having two rows, from Greek distikhos; see distich.]
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.
(Botany) (of leaves) arranged in two vertical rows on opposite sides of the stem
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
dis•ti•chous(ˈdɪs tɪ kəs)
1. arranged alternately in two vertical rows on opposite sides of a stem, as leaves.
2. Zool. divided into two parts.
[1745–55; < New Latin, Latin distichus < Greek dístichos; see distich]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.