rachis

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Related to rachides: rachilla

rachis

[′rā·kəs]
(anatomy)
The vertebral column.
(biology)
An axial structure such as the axis of an inflorescence, the central petiole of a compound leaf, or the central cord of an ovary in Nematoda.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Despite the numerous axes and rachides found, it is not possible to shed new light on the question of a bifurcated frond of Alethopteris, nor is it possible to assign with certainty any of the two major foliar species to any of the collected axes because of non-attachment.