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tetrastichous

[ti-tras-ti-kuh s]
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adjective Botany.
  1. arranged in a spike of four vertical rows, as flowers.
  2. having four such rows of flowers, as a spike.
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Origin of tetrastichous

1865–70; < New Latin tetrastichus < Greek tetrástichos having four lines or rows. See tetra-, stich1, -ous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for tetrastichous

tetrastichous

adjective
  1. (of flowers or leaves on a stalk) arranged in four vertical rows
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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