[f. Gr. ἔνδο-ν (see ENDO-) + δέρμ-α skin.]

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  1.  Bot. a. A layer of large cambium cells lying beneath the liber. b. The inner layer of the wall of a vegetable cell.

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1835.  Lindley, Introd. Bot. (1848), I. 193. The cellular face of the liber … A. Richard distinguishes by the name of Subliberian layer, or Endoderm.

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  2.  Biol. a. The inner layer of the blastoderm. b. The lining of the internal cavity of the Cœlenterata.

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1861.  J. R. Greene, Man. Anim. Kingd., Cœlent., 21. The endoderm, whose free surface forms the lining of the large internal cavity.

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1862.  H. Spencer, First Princ., II. xix. § 152 (1875), 417. The … blastoderm … divides into two layers … the ectoderm and the endoderm.

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1877.  Huxley, Anat. Inv. Anim., iii. 113. The endoderm … is composed of a layer of very distinct cells.

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  Hence Endodermal, Endodermic adjs., pertaining to or of the nature of an endoderm; Endodermis [on the analogy of epidermis], Bot.

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1877.  Huxley, Anat. Inv. Anim., i. 57. The endodermal lining of the enterocœle. Ibid., iii. 114. The flagella of the endodermic cells.

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1884.  Bower & Scott, De Bary’s Phaner. & Ferns, 121. The endodermis is a sheath consisting in all cases of one single layer of cells.

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