adjective Botany.
(of a bundle) having the xylem lined with phloem on both its inner and outer faces.

1880–85; bi-1 + collateral

bicollaterality, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bicollateral (ˌbaɪkɒˈlætərəl)
botany (of a vascular bundle) having two phloem groups to the inside and outside, respectively, of the xylem

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