invertebrate

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invertebrate

 [in-ver´tĕ-brāt]
1. having no vertebral column.
2. any animal that has no vertebral column.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

in·ver·te·brate

(in-ver'tĕ-brāt),
1. Not possessed of a spinal or vertebral column.
2. Any animal that has no spinal column.
Farlex Partner Medical Dictionary © Farlex 2012

invertebrate

(ĭn-vûr′tə-brĭt, -brāt′)
adj.
1. Lacking a backbone or spinal column; not vertebrate.
2. Of or relating to invertebrates: invertebrate zoology.
n.
An animal, such as an insect or mollusk, that lacks a backbone or spinal column.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

in·ver·te·brate

(in-vĕr'tĕ-brăt)
1. Not possessed of a spinal or vertebral column.
2. (in-vĕr'tĕ-brāt) Any animal that has no spinal column.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

invertebrate

any animal that does not possess a backbone.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005