| IDL | Index to Dental Literature; interface definition language; intermediate density lipoprotein; interme... |
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| WBGT index | Wet Bulb Globe Thermometer index = 0.7tw + 0.3k{(tg-ta)oK + ta} ta; 건... |
| AEI | arbitrary evolution index; atrial emptying index |
| AHI | active hostility index; Animal Health Institute; apnea-plus-hypopnea index |
| BI | background interval; bacterial or bactericidal index; base-in [prism]; basilar impression; Billroth ... |
| centromeric index | The ratio of the length of the short arm of the chromosome to that of the total chromosome; ordinarily expressed as a percentage. (05 Mar 2000) |
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| cephalic index | The ratio of the maximal breadth to the maximal length of the head, obtained by the formula: (breadth × 100)/length. Synonym: length-breadth index. (05 Mar 2000) |
| pelvic index | The ratio of the conjugate of the pelvic inlet to the transverse diameters of the pelvis: (conjugate of pelvic inlet × 100)/transverse diameter. (05 Mar 2000) |
| cephalo-orbital index | The ratio of the cubic content of the two orbits to that of the cranial cavity multiplied by 100. (05 Mar 2000) |
| cephalorrhachidian index | The figure obtained by multiplying the pressure of the cerebrospinal fluid, after fluid has been withdrawn by spinal puncture, by the quantity of fluid withdrawn and then dividing by the original pressure. Synonym: cephalorrhachidian index. (05 Mar 2000) |
| gnathic index | Relation between the basialveolar (basion to alveolar point) and basinasal (basion to nasion) lengths: (basialveolar length × 100)/basinasal length; the result indicates the degree of projection of the maxilla or upper jaw. Synonym: alveolar index. (05 Mar 2000) |
| cerebral index | The ratio of the transverse to the anteroposterior diameter of the cranial cavity multiplied by 100. (05 Mar 2000) |
| cerebrospinal index | The figure obtained by multiplying the pressure of the cerebrospinal fluid, after fluid has been withdrawn by spinal puncture, by the quantity of fluid withdrawn and then dividing by the original pressure. Synonym: cephalorrhachidian index. (05 Mar 2000) |
| chemotherapeutic index | The ratio of the minimal effective dose of a chemotherapeutic agent to the maximal tolerated dose. Originally used by Ehrlich to express the relative toxicity of a chemotherapeutic agent to a parasite and to its host. (05 Mar 2000) |
| chest index | Anteroposterior diameter of the thorax times 100 divided by the transverse diameter of the thorax. Synonym: chest index. (05 Mar 2000) |
| periodical index | Useful as a subject approach to the contents of a periodical issuing an annual, biennial, quinquennial, decennial, etc., index. The heading is used for the overall body of articles published by a periodical in the same sense that bibliography is useful when published as a single article. (12 Dec 1998) |
| Periodontal Disease Index | An index used for estimating the degree of periodontal disease based on the measurement of six representative teeth for gingival inflammation, pocket depth, calculus and plaque, attrition, mobility, and lack of contact. (05 Mar 2000) |
| periodontal index | A numerical rating scale for classifying the periodontal status of a person or population with a single figure which takes into consideration prevalence as well as severity of the condition. It is based upon probe measurement of periodontal pockets and on gingival tissue status. (12 Dec 1998) |
| metacarpal index | The average ratio of length to breadth of metacarpals II to V; this ratio is increased in the Marfan syndrome. (05 Mar 2000) |
| Robinson index | An index used to calculate heart work load. See: double product. (05 Mar 2000) |