Concentric Bundle

Also found in: Medical.

concentric bundle

[kən′sen·trik ′bən·dəl]
A vascular bundle in which xylem surrounds phloem, or phloem surrounds xylem.

Concentric Bundle


a bundle of conducting tissues of xylem and phloem in the stems and leaves of several ferns and angiosperms. In an amphicribral bundle, the phloem surrounds the xylem. In an amphibasal bundle, the xylem surrounds the phloem.

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Utilizing the DSL networks of both Covad and NorthPoint Communications, Concentric bundles together the multiple piece parts required to deploy DSL service, including CPE hardware, management of the installation process, 24/7 technical support and value-add IP services like e-mail and Web hosting.