triserial

[ trahy-seer-ee-uh l ]
/ traɪˈsɪər i əl /

adjective

arranged in three series or rows.
Botany. having only three verticils.

Origin of triserial

First recorded in 1855–60; tri- + serial
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for triserial

triserial

/ (traɪˈsɪərɪəl) /

adjective

arranged in three rows or series
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