aortal (aortal)

aortic. [Rare.] aortic (a-ôr'tik), a. [ ing or pertaining to the aorta. - Aortic arch. ( a ) The permanent arch of the aorta. See aorta. (b) One of the five or more pairs of arterial arches of the embryo of a vertebrate, formed by for kings of the primitive cardiac aorta, and reuniting to form the primitive and finally the definitive subvertebral aorta, or aorta proper. There is a pair of such aortic arches to each pair of visceral arches of the neck. In the higher vertebrates the two anterior pairs disappear; the third pair is modified into the carotid arteries supplying the head; the fourth pair becomes the arteries supplying the anterior limbs and the permanent arch of the aorta-in man, the innominate and right subclavian on the right side, and the left subclavian and arch of the aorta on the left; in the fifth pair in man the right side is obliterated, and the left forms the permanent pulmonary artery, the descending aorta, and the duct us arteriosus, which is the communication between the fifth and the fourth arches. In branchiate vertebrates most of these arches are permanent, becoming b the blood-ve els of the gills.Aortic bulb, the enlargement at the beginning of the cardiac aorta. Aortic compre or, in surg ., an instrument, used in cases of amputation at the hip-joint, for compre ing the aorta, in order to limit the flow of blood from it to the divided femoral artery. - Aortic orifice, aortic aperture, of the diaphragm, the hole of the diaphragm, between its right and left pillars, through which the aorta pa es from the thorax into the abdomen; it also gives transit to the thoracic duct, and usually to an azygous vein. - Aortic valves, the three semilunar valves at the ori A pan teles of the subfamily Ovinæ and family Bovidae, inhabiting northern Africa. It is of a light-brownish color, with very large horns curving outward and backward, and a profusion of long hair hanging from the throat and breast and almost reaching the ground between the fore legs. A full-grown individual stands about 3 feet high at the withers, and its horns sometimes attain a length of 2 feet. The animal is common, is often kept in confinement, and readily breeds in that state. The aou dad is also known as the bearded argali and ruffed mou flon; it is the kebsh of the Arabs, the mouflon à manchet tes of the French, and the Ovis tragelaph us (Desmarest) or Ammo tragus tragelaph us of naturalists. aoul (ä'öl), n. [Ru . aulů, a village (of the Caucasians).] Among the people of the Caucasus, a village or a village community; hence, a Tatar camp or encampment. The aoul consisted of about twenty tents, all constructed on the same model, and scattered about in sporadic fashion without the least regard to symmetry. D. M. Wallace, Ru ia, p. 330. à outrance (ä ö-trons'). [F.: see outrage.] To exce or to the utmost; with extreme vehemence; without limitation or reserve: as, to fight à outrance. Often, incorrectly, à l'ou trance.