isopedinen.
/ʌɪsəˈpiːdɪn//ʌɪˈsɒpədɪn/ Ichthyology.
A bony material, present as a layer in some fish scales, consisting of sheets of collagenous fibres within a mineralized matrix.
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the world > animals > fish > parts of fish > [noun] > scales or parts of
mails1484
fish-scalea1661
argentine1839
isopedine1907
1907 E. S. Goodrich in Proc. Zool. Soc. 757 The stratification of the isopedine indicates the lines of growth.
1909 E. S. Goodrich in E. R. Lankester Treat. Zool. 9 217 The latter [sc. cosmoid scale] is formed of three layers: a middle layer of bone with large vascular anastomosing channels; an inner layer of bony ‘isopedin’, in which the matrix is deposited in successive laminae, and the cells are arranged in parallel planes; and an outer layer of ‘cosmin’.
1920 I. F. & W. D. Henderson Dict. Sci. Terms 158/1 Isopedine.
1962 K. F. Lagler et al. Ichthyol. iv. 115 In a ganoid scale..the innermost lamellar bony layer is isopedine.
1974 M. Hildebrand Analysis Vertebr. Struct. v. 99 The basal layer, which now forms the bulk of the scale, remains acellular but is laced by collagenous fibers coursing in various directions. The resulting bone (called isopedine) is somewhat flexible and soft.
This entry has not yet been fully updated (first published 1993; most recently modified version published online December 2020).
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n.1907