ecto-comb. form

1864 Webster's Amer. Dict. Eng. Lang. Ecto-blast, the Membrane composing the walls of a cell.

1889 Cent. Dict. Ectoblastic.

1902 Daily Chron. 16 Sept. 5/2 A pair of ectoblastic invaginations.

1910 Practitioner Jan. 40 The core of the chorionic villus is mesoblastic in origin,..whereas the trophoblast is ectoblastic.

1888 G. Rolleston & W. H. Jackson Forms Animal Life 557 The ectobranchiate Desmosticha.

1854 R. Owen in Circle of Sci. (c1865) II. 74/2 There are three calcaneal processes..the third, called ‘ectocalcaneal’, from behind the ectocondyloid cavity and the ectometatarse.

1889 A. Macalister Text-bk. Human Anat. 38 The mesoblastic tissue..is replaced by bone in either of two ways, which are called respectively ectochondral and entochondral ossification.

1913 Cunningham's Text-bk. Anat. (ed. 4) 86 Cartilage bones are those which are preformed in cartilage, and include most of the bones of the skeleton. Their growth is often described as endochondral and ectochondral, the former term implying the deposition of membrane bone in the centre of the cartilage, while the latter signifies a deposit of membrane bone on the surface of the cartilage.

1887 W. J. Sollas in Encycl. Brit. XXII. 415/1 A transverse muscular sphincter, which defines an outer division or ectochone from an inner or endochone.

1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 795 The..chonae..are divided into an outer part, the ectochone, long and cylindrical, and an inner part, the endochone.

1854 R. Owen in Circle of Sci. (c1865) II. 74/1 The ‘ectocondyloid’ surface.

1850 R. Owen Monogr. Fossil Reptilia London Clay ii. 29 A smaller ossicle, wedged between the astragalus and the metatarsals of the second and thrid toes is the ‘ectocuneiform’.

1873 St. G. Mivart Lessons Elem. Anat. v. 208 The ecto-cuneiform 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. Animal Kingdom II. 11 The ectoderm growing from within outwards.

1879 tr. E. Haeckel 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 T. H. Huxley Man. Anat. Invertebrated Animals i. 55 The ectodermal cells constitute the epidermis (ecderon).

1877 M. Foster Text Bk. Physiol. iii. 74 The junction of the ectodermic muscular process [in Hydra] with the body of its cell.

1927 C. F. Marbut tr. K. D. Glinka Great Soil Groups 34 We propose to designate them as endo~dynamomorphic soils to distinguish them from the ekto~dynamomorphic soils in which external factors predominate over the internal.

1930 Nature 19 July 89 Ektodynamomorphic soils, that is, those in which climatic and other external factors in soil formation predominate over internal ones.

1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 91 Anteriorly to the septum is a large bone, the ecto-ethmoid..(= the pre-frontal of Huxley).

1928 C. F. Cooper Parker & Haswell's Text-bk. Zool. (ed. 4) II. 78 The outer walls of the olfactory capsules may be ossified by paired ecto-ethmoids.

1884 A. Sedgwick & F. G. Heathcote tr. C. Claus Elem. Text-bk. Zool.: Protozoa to Insecta 112 The first processes of segmentation in these at first ectolecithal ova [Ger. ectolecithalen Eiern] are withdrawn from observation, since they take place in the centre of an egg covered by a superficial layer of food yolk.

1905 Amer. Geol. Apr. 244 The outer border (ectoloph) rises higher than the cross crests.

1966 A. S. Romer Vertebr. Paleontol. (ed. 3) xx. 239 An ectoloph, forming the outer wall of the tooth, connecting paracone and metacone and often..with a W-shaped contour.

1889 Cent. Dict. Ectomere.

1890 J. S. Billings National Med. Dict. I Ectomere, the larger of the two primitive cells produced by the segmentation of the mammalian ovum after impregnation.

1924 E. G. Conklin in E. V. Cowdry Gen. Cytol. 584 The subdivisions of these ectomeres are much more numerous in large eggs than in small ones.

1854 R. Owen in Circle of Sci. (c1865) II. 74/2 There are three calcaneal processes..the third, called ‘ectocalcaneal’, from behind the ectocondyloid cavity and the ectometatarse.

1909 A. Sedgwick Student's Text-bk. Zool. III. iii. 123 The ectodermal part of this plexus, which is continuous with the endodermal and may be called the ectoneural, is especially concentrated in an annular tract round the mouth.

1962 D. Nichols Echinoderms ii. 28 The main sensory part lies orally, and has been called the superficial oral or ectoneural system.

1861 R. T. Hulme tr. C. H. Moquin-Tandon Elements Med. Zool. ii. vi. 291 Those Parasites which derive their nourishment from the skin..have..been named..Ectoparasites [Fr. Ectoparasites].

1877 T. H. Huxley Man. Anat. Invertebrated Animals iv. 192 Balatro [is] an ectoparasite, upon oligochætous Annelids.

1870 G. Rolleston Forms Animal Life Introd. 42 The Myxinoids..are..ecto-parasitic.

1903 Jrnl. Royal Microsc. Soc. 500 The shedding of the ectoparenchyma.

1883 D. MacAlister tr. E. Ziegler Text-bk. Pathol. Anat. i. 354 Ectophyte.

1902 Encycl. Brit. XXV. 439/1 There is a reciprocal symbiosis between the Angiosperm and the fungus which is endophytic, only rarely ectophytic.

1902 Encycl. Brit. XXV. 439/1 More or fewer of their rootlets have their extremities invested by a weft of hyphal mycelium as an ectophytic mycorhiza.

1873 St. G. Mivart Lessons Elem. Anat. iii. 131 The bony palate may be enriched by the addition..of two extra bones, the ecto-pterygoid and the ento-pterygoid.

1890 Jrnl. Anat. 25 106 The demarcation between these two parts is due to the presence of a fissure, more or less distinctly defined in different animals, which has been named the rhinal or ectorhinal fissure.

1904 A. Keith Human Embryol. (ed. 2) 258 Hippocampal and Ectorhinal Fissures.

1877 T. H. Huxley Man. Anat. Invertebrated Animals ii. 94 Beneath this lies a thick cortical layer (ectosarc) distinguished by its clearness and firmness from the semifluid central substance (endosarc).

1887 Encycl. Brit. XXII. 415/1 An outer or ectosome and an inner or choanosome.

1959 Chambers's Encycl. XIII. 101/2 The ectosome consists of a single-layered epithelium which may become several layers thick.

1888 W. J. Sollas in Rep. Sci. Results Voy. H.M.S. Challenger: Zool. XXV. p. xvi This cleavage occurs parallel to the outer surface, dividing the sponge at once into a choanosomal and ectosomal portion.

1868 W. K. Parker Monogr. Struct. & Devel. Shoulder-girdle & Sternum Vertebrata 66 In all the known Urodela the endosteal deposits are entirely ruled by the much earlier and more potent ectosteal sheath.

1885 W. K. Parker in Proc. Royal Soc. 29 Jan. 135 This malleus in its articular part has two endosteal and one ectosteal bony centre.

1870 W. H. Flower Introd. Osteol. Mammalia vii. 74 They ossify, according to Parker, ectosteally, or from without inwards.

1880 T. H. Huxley Crayfish iv. 194 Immediately beneath the epiostracum, there is a zone..distinguished as the ectostracum.

1898 A. S. Packard Text-bk. Entomol. 684 The larval ectotrachea undergoes histolysis.

1860 R. G. Mayne Expos. Lexicon Med. Sci. Ectozoon, a general term for those parasitic insects..that infest the surface, or external part of the body, in distinction from the Entozoa.