| limen | Entrance; the external opening of a canal or space, such as limen insulae. Synonym: threshold. Origin: L. (05 Mar 2000) |
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| limen insulae | The band of transition between the anterior portion of the gray matter of the insula and the anterior perforated substance; it is formed by a narrow strip of olfactory cortex along the lateral side of the lateral olfactory stria. Synonym: threshold of island of Reil. (05 Mar 2000) |
| limen nasi | A ridge marking the boundary between the nasal cavity proper and the vestibule. Synonym: threshold of nose. (05 Mar 2000) |
| absolute intensity threshold acuity | The minimal light that can be seen. (05 Mar 2000) |
| radiant intensity | The luminous flux per unit solid angle in a given direction. Synonym: candle-power, radiant intensity. (05 Mar 2000) |
| dose intensity | In chemotherapy, the total amount of drug delivered in a one-week period. Can be given all at once or over a period of several days. (16 Dec 1997) |
| intensity | The condition or quality of being intense, a high degree of tension, activity or energy. Origin: L. Intensus = intense, tendere = to stretch (18 Nov 1997) |
| intensity of sound | The objective measurement of the amplitude of vibration of a sound wave. (05 Mar 2000) |
| unit of magnetic field intensity | See: gauss, tesla. (05 Mar 2000) |
| luminous intensity | The luminous flux per unit solid angle in a given direction. Synonym: candle-power, radiant intensity. (05 Mar 2000) |
| alveolar-arterial oxygen difference | The difference or gradient between the partial pressure of oxygen in the alveolar spaces and the arterial blood: P(A-a)02. Normally in young adults this value is less than 20 mm Hg. See: alveolar gas equation. (05 Mar 2000) |
| arteriovenous carbon dioxide difference | <physiology> The difference in carbon dioxide content (in ml per 100 ml blood) between arterial and venous blood. (05 Mar 2000) |
| arteriovenous oxygen difference | <physiology> The difference in the oxygen content (in ml per 100 ml blood) between arterial and venous blood. (05 Mar 2000) |
| A-V difference | <abbreviation> Arteriovenous difference of concentration of a substance. (05 Mar 2000) |
| brightness difference threshold | The smallest difference that can be perceived as a difference in brightness. Synonym: light difference. (05 Mar 2000) |