| SDA | right sacroanterior [fetal position] [Lat. sacrodextra anterior]; sialodacryoadenitis; specific dyna... |
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| SLA | left sacroanterior [fetal position] [Lat. sacrolaeva anterior]; single-cell liquid cytotoxic assay; ... |
| OLA | Occipito Laevo Anterior; Left Occipito Anterior; 후두전좌측의 |
| ACA | abnormal coronary artery; acrodermatitis chronica atrophicans; acute cerebellar ataxia; adenocarcino... |
| AICA | anterior inferior cerebellar artery; anterior inferior communicating artery |
| occipitoanterior position | A cephalic presentation of the foetus with its occiput turned toward the right (right occipitoanterior, ROA) or to the left (left occipitoanterior, LOA) acetabulum of the mother. (05 Mar 2000) |
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| occipitoposterior position | A cephalic presentation of the foetus with its occiput turned toward the right (right occipitoposterior, ROP) or to the left (left occipitoposterior, LOP) sacroiliac joint of the mother. (05 Mar 2000) |
| occipitotransverse position | A cephalic presentation of the foetus with its occiput turned toward the right (right occipitotransverse, ROT) or to the left (left occipitotransverse, LOT) iliac fossa of the mother. (05 Mar 2000) |
| occlusal position | The relationship of the mandible and maxillae when the jaws are closed and the teeth are in contact; it may or may not coincide with centric occlusion. (05 Mar 2000) |
| orthopnea position | The position assumed by patients with orthopnea, namely sitting propped up in bed by several pillows. Synonym: orthopnea position. (05 Mar 2000) |
| orthopneic position | The position assumed by patients with orthopnea, namely sitting propped up in bed by several pillows. Synonym: orthopnea position. (05 Mar 2000) |
| terminal hinge position | The mandibular hinge position from which further opening of the mandible would produce translatory rather than hinge movement. (05 Mar 2000) |
| eccentric position | Any relation of the mandible to the maxillae other than centric relation. Synonym: eccentric position. (05 Mar 2000) |
| electrical heart position | A description of the heart's assumed electrical habitus based upon the form of the QRS complexes in leads aVL, aVF, V1, and V6. Sometimes loosely (and inaccurately) used to describe the frontal plane electric axis. Synonym: heart position. (05 Mar 2000) |
| Elliot's position | A supine position upon a double inclined plane or on a single inclined plane, with a cushion under the back at the level of the liver; used to facilitate abdominal section. (05 Mar 2000) |
| energy of position | <chemistry> Energy due to position, it is stored energy which can be used to do work. (09 Jan 1998) |
| English position | A position to facilitate a vaginal examination, the patient lying on the side with the under arm behind the back, the thighs flexed, the upper one more than the lower. Synonym: English position, lateral recumbent position, semiprone position. (05 Mar 2000) |
| Trendelenburg's position | A supine position on the operating table, which is inclined at varying angles so that the pelvis is higher than the head with the knees flexed and legs hanging over the end of the table; used during and after operations in the pelvis or for shock. (05 Mar 2000) |
| knee-chest position | A prone posture resting on the knees and upper part of the chest, assumed for gynecologic or rectal examination. Synonym: genupectoral position. (05 Mar 2000) |
| knee-elbow position | A prone position resting on the knees and elbows, assumed for gynecologic or rectal examination or operation. Synonym: genucubital position. (05 Mar 2000) |