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n. pl. mon·o·po·di·a (-dē-ə)
A main axis of a plant, such as the trunk of a spruce, that maintains a single line of growth, giving off lateral branches.
[New Latin, from Late Latin monopodius, one-footed, from Greek monopous : mono-, mono- + pous, pod-, foot; see ped- in Indo-European roots.]
mon′o·po′di·al (-dē-əl) adj.
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.
n, pl -dia (-dɪə)
(Botany) the main axis of growth in the pine tree and similar plants: the main stem, which elongates from the tip and gives rise to lateral branches. Compare sympodium
[C19: New Latin, from Greek monopous, from mono- + pous foot]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014