| invertebrate | <zoology> Destitute of a backbone; having no vertebrae; of or pertaining to the Invertebrata. One of the Invertebrata. Age of invertebrates. See Age, and Silurian. Source: Websters Dictionary (01 Mar 1998) |
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| invertebrate hormones | Hormones produced by invertebrates, usually insects, mollusks, annelids, and helminths. (12 Dec 1998) |
| invertebrates | Animals that have no spinal column. (12 Dec 1998) |
| ganglia, invertebrate | Clusters of neuronal cell bodies in invertebrates. Invertebrate ganglia may also contain neuronal processes and non-neuronal supporting cells. Many invertebrate ganglia are favourable subjects for research because they have small numbers of functional neuronal types which can be identified from one animal to another. (12 Dec 1998) |
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| receptors, invertebrate peptide | Cell surface receptors for invertebrate peptide hormones or neuropeptides. (12 Dec 1998) |
| photoreceptors, invertebrate | Cells in invertebrates which are specialised to detect and transduce light and darkness and relay that information centrally in the nervous system. (12 Dec 1998) |