| extravert | A gregarious person whose chief interests lie outside the self, and who is socially self-confident and involved in the affairs of others. Compare: introvert. Synonym: extravert. (05 Mar 2000) |
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| extravisual | Outside the field of vision, or beyond the visible spectrum. (05 Mar 2000) |
| extravital ultraviolet | Having wavelengths of 2900 to 1850 A |
| extreme | As far away as possible from the centre, the beginning or the average, of the highest degree or intensity (18 Nov 1997) |
| extreme capsule | The layer of white matter separating the claustrum from the cortex of the insula, probably representing largely corticopetal and corticofugal fibres of the insular cortex. Synonym: capsula extrema. (05 Mar 2000) |
| extreme halophile | An organism whose growth is dependent on large amounts (generally more than 10% in solution) of salt (sodium chloride, NaCl). (09 Oct 1997) |
| extremital | Relating to an extremity. See: distal. (05 Mar 2000) |
| extremitas | Synonym: extremity. See: limb. Origin: L. Fr. Extremus, last, outermost (05 Mar 2000) |
| extremitas acromialis claviculae | The flattened lateral end of the clavicle that articulates with the acromion and is anchored to the coracoid process by the conoid and trapezoid ligaments. Synonym: extremitas acromialis claviculae, acromial end of clavicle. (05 Mar 2000) |
| extremitas anterior | Specifically, the anterior end of the spleen (extremitas anterior splenis ). Synonym: extremitas anterior. (05 Mar 2000) |
| extremitas inferior | For a structure having a vertically-oriented long axis, the point at the lower end of the axis, nearest the soles of the feet; the lowest point of a structure's surface. See: inferior pole of kidney, inferior pole of testis. Synonym: extremitas inferior, inferior extremity. (05 Mar 2000) |
| extremitas inferior renis | The inferior end of the kidney. Synonym: extremitas inferior renis. (05 Mar 2000) |
| extremitas inferior testis | The inferior end of the testis. Synonym: extremitas inferior testis. (05 Mar 2000) |
| extremitas posterior | Specifically, the posterior end of the spleen (extremitas posterior splenis ). Synonym: extremitas posterior. (05 Mar 2000) |
| extremitas sternalis claviculae | The enlarged medial end of the clavicle that articulates with the manubrium sterni. Synonym: extremitas sternalis claviculae, sternal end of clavicle. (05 Mar 2000) |