| exobiology | The interdisciplinary science that studies evolutionary biology, including the origin and evolution of the major elements required for life, their processing in the interstellar medium and in protostellar systems. This field also includes the study of chemical evolution and the subsequent interactions between evolving biota and planetary evolution as well as the field of biology that deals with the study of extraterrestrial life. (12 Dec 1998) |
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| exocardia | Congenital displacement of the heart. Synonym: exocardia. Origin: ecto-+ G. Kardia, heart (05 Mar 2000) |
| exocardiac | <anatomy> Situated or arising outside of the heat; as, exocardial murmurs; opposed to endocardiac. Origin: Exo- + Gr. Heat. Source: Websters Dictionary (01 Mar 1998) |
| exocardial | <anatomy> Situated or arising outside of the heat; as, exocardial murmurs; opposed to endocardiac. Origin: Exo- + Gr. Heat. Source: Websters Dictionary (01 Mar 1998) |
| exocarp | The outer layer or skin of a pericarp. (09 Oct 1997) |
| exoccipital | <anatomy> Pertaining to a bone or region on each side of the great foremen of the skull. The exoccipital bone, which often forms a part of the occipital in the adult, but is usually distinct in the young. Origin: Pref. Ex- + occipital. Source: Websters Dictionary (01 Mar 1998) |
| exoccipital bone | The part of the occipital bone that lies on either side of the foramen magnum. Synonym: pars lateralis ossis occipitalis, exoccipital bone. (05 Mar 2000) |
| exocellular | Refers to reactions or processes that are initiated inside a cell butactually take place outside it. (09 Oct 1997) |
| exocelomic membrane | A layer of cells delaminated from the inner surface of the blastocystic cytotrophoblast and from the envelope of the primary yolk sac during the second week of embryonic life. Synonym: Heuser's membrane. (05 Mar 2000) |
| exocoetus | <zoology> A genus of fishes, including the common flying fishes. See Flying fish. Origin: NL. Exocetus, L. Exocoetus a fish that sleeps on the shore, Gr,lit, sleeping out; outside of + bed. Source: Websters Dictionary (01 Mar 1998) |
| exocrine | 1. <physiology> Secreting outwardly, via a duct. 2. <anatomy> Denoting such a gland or its secretion. Compare: endocrine. Origin: Gr. Krinein = to separate (18 Nov 1997) |
| exocrine gland | <anatomy> A gland that secretes its products through ducts or canals, such as sweatglands or mammary glands. Compare: endocrine gland. (09 Oct 1997) |
| exocrine pancreatic insufficiency | Lack of exocrine secretions of pancreas, due to destruction of acini, usually by chronic pancreatitis; lack of digestive enzymes from pancreas results in diarrhoea, usually fatty (steatorrhoea) because of lack of pancreatic enzymes. (05 Mar 2000) |
| exocrine part of pancreas | exocrine part of pancreas |
| exocyclic | Relating to atoms or groups attached to a cyclic structure but not themselves cyclic; e.g., the -CH3 group of toluene. Compare: endocyclic. (05 Mar 2000) |