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1. Any of a class of extracellular proteins that are composed of three coiled polypeptide chains, form strong fibers, and are the main constituents of cartilage, bone, and other connective tissues in animals.
2. Material composed principally of collagen proteins. Collagen is converted into gelatin when boiled in water.

[Greek kolla, glue + -gen.]

col′la·gen′ic (-jĕn′ĭk), col·lag′e·nous (kə-lăj′ə-nəs) adj.
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Adj.1.collagenous - relating to or consisting of collagen
References in periodicals archive ?
It is composed primarily of longitudinally arranged collagenous tissue and a few clastic fibers.
A previously published study on glutaraldehyde fixation of collagenous tissue showed that crosslinking simultaneously increases mechanical strength and decreases degradation by enzymatic processes.
Progressive mechanical loading is more likely to restore the strength and morphological characteristics of collagenous tissue.
Scars can also lead to nerve impingement and tissue hypoxia, as the blood supply can be restricted by newly formed collagenous tissue.
Immunohistochemical staining revealed a light distribution of CD3/CD5-positive T cells within the collagenous tissue, together with CD68-positive and lysozyme-positive histiocytes.