repr. Gr. ἐκτο, -stem of ἐκτός adv., outside; employed as comb. form in many compounds of mod. formation, as Ecto-blast [Gr. βλαστός sprout], see quot. Ecto-calcaneal a., see quot. and CALCANEAL. Ecto-condyloid [Gr. κόνδυλος knuckle + -OID], see quot. Ecto-cuneiform a., see quot. and CUNEIFORM. Ectocyst [Gr. κύστ-ις bag], see quot. and CYST. Ectoderm [Gr. δέρμα skin], the outer layer of the blastoderm, also called epiblast; also, a term applied to the outer layer of the body of the Cœlenterata; hence Ectodermal a., Ectodermic a. Ecto-metatarse [mod.L. metatarsus the bones between the tarsus and the toes], see quot. for Ecto-calcaneal. Ecto-parasite, see quot. 1861; hence Ecto-parasitic a. Ectoplasm [Gr. πλάσμα something molded or formed], see quot.; hence Ectoplasmic a. Ecto-proctous a. [Gr. πρωκτός anus, rump], belonging to the Ectoprocta, an order of Polyzoa having the anus outside the mouth-tentacles. Ecto-pterygoid a. [see PTERYGOID], see quot. Ecto-sarc. Zool. [Gr. σάρξ, σαρκ-ός flesh], the outer transparent sarcode-layer of certain rhizopods, such as the Amœba. Ectostosis [on the analogy of Gr. ἐξόστωσις, f. ὀστέον bone], an external growth of bone. Ectozoon (pl. -a) [Gr. ζῶον animal], see quot.
1864. Webster, *Ecto-blast, the Membrane composing the walls of a cell.
1854. Owen, in Circ. Sc. (c. 1865), II. 74/2. There are three calcaneal processes … the third, called *‘ectocalcaneal,’ from behind the ectocondyloid cavity and the ectometatarse. Ibid., 74/1. The *‘ectocondyloid’ surface. Ibid., 68/2. A smaller ossicle … is the *‘ectocuneiform.’
1873. Mivart, Elem. Anat., v. 208. The ecto-cuneiforme may enormously preponderate over the other cuneiforms, as in the Horse.
1880. Athenæum, 23 Oct., 536/1. Each individual of a colony of Polyzoa is encased in a cell known as the *ectocyst.
1861. J. R. Greene, Man. Anim. Kingd., Cœlent., 11. The *ectoderm growing from within outwards.
1879. trans. Haeckel’s Evol. Man, I. iii. 67. The upper germ-layer, from which the outer skin and the flesh proceed, Huxley named Ecto-derm, or Outer layer.
1877. Huxley, Anat. Inv. Anim., i. 55. The *ectodermal cells constitute the epidermis (ecderon).
1877. Foster, Text-bk. Physiol., iii. 74. The junction of the *ectodermic muscular process [in Hydra] with the body of its cell.
1861. Hulme, trans. Moquin-Tandon, II. VI. 291. Those Parasites which derive their nourishment from the skin … have … been named … *Ectoparasites.
1877. Huxley, Anat. Inv. Anim., iv. 192. Balatro [is] an ectoparasite, upon oligochætous Annelids.
1870. Rolleston, Anim. Life, Introd. p. xlii. The Myxinoids … are … *ecto-parasitic.
1883. J. E. Ady, in Knowledge, 15 June, 355/2. Its [Amœba’s] jelly-like body becomes faintly parcelled out into an outer firm (*ectoplasm) and an inner soft (endoplasm) layer.
1882. Vines, Sachs’ Bot., 583. Two cells … separated … by an *ectoplasmic layer … of protoplasm.
1877. Huxley, Anat. Inv. Anim., viii. 460. The characteristic polypide of the *ectoproctous Polyzoa is a structure developed from the cystid.
1872. Mivart, Elem. Anat., 131. The bony palate may be enriched by the addition … of two extra bones, the *ecto-pterygoid and the ento-pterygoid.
1877. Huxley, Anat. Inv. Anim., ii. 94. Beneath this lies a thick cortical layer (*ectosarc), distinguished by its clearness and firmness from the semifluid central substance (endosarc).
1860. Mayne, Exp. Lex., *Ectozoon, a general term for those parasitic insects … that infest the surface, or external part of the body, in distinction from the Entozoa.
