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n. pl. sym·po·di·a (-dē-ə)
An apparent axis that develops when growth occurs by means of lateral branches rather than continuing along the principal stem, often having a zigzag or irregular form. Also called pseudaxis.
sym·po′di·al (-dē-əl) adj.
n, pl -dia (-dɪə)
(Botany) the main axis of growth in the grapevine and similar plants: a lateral branch that arises from just behind the apex of the main stem, which ceases to grow, and continues growing in the same direction as the main stem. Compare monopodium
[C19: from New Latin, from syn- + Greek podion a little foot, from pous foot]
sym•po•di•um(sɪmˈpoʊ di əm)
n., pl. -di•a (-di ə)
a stem that is made up of the bases of a number of other stems that grow in succession, as in the grapevine.