| PD | Doctor of Pharmacy; Dublin Pharmacopoeia; interpupillary distance; Paget disease; pancreatic duct; p... |
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| Pr | praseodymium; prednisolone; presbyopia; primary; prism; production rate [of steroid hormones]; prola... |
| pr | far point of accommodation [Lat. punctum remotum]; pair; per rectum; prism |
| apex of orbit | The posterior part of the orbit into which the optic canal opens; forms the tip of the pyramidal-shaped space. (05 Mar 2000) |
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| apex of patella | The pointed lower end of the patella from which the ligamentum patellae passes to insert on the tibial tuberosity. Synonym: apex patellae. (05 Mar 2000) |
| apex of petrous part of temporal bone | The irregular antero-medial extremity of the petrous part on which the anterior end of the carotid canal opens. Synonym: apex partis petrosae ossis temporalis. (05 Mar 2000) |
| apex of prostate | The lowermost part of the prostate, situated above the urogenital diaphragm. Synonym: apex prostatae. (05 Mar 2000) |
| apex of sacrum | The tapering lower end of the sacrum that articulates with the coccyx. Synonym: apex ossis sacri. (05 Mar 2000) |
| apex of the posterior horn | The pointed extremity of each posterior gray column or cornu of the spinal cord. Synonym: apex cornus posterioris, caput cornus, tip of posterior horn. (05 Mar 2000) |
| apex of urinary bladder | The junction of the superior and anteroinferior surfaces of the bladder, continuous above with the median umbilical ligament. Synonym: apex vesicae. (05 Mar 2000) |
| apex ossis sacri | The tapering lower end of the sacrum that articulates with the coccyx. Synonym: apex ossis sacri. (05 Mar 2000) |
| apex partis petrosae ossis temporalis | The irregular antero-medial extremity of the petrous part on which the anterior end of the carotid canal opens. Synonym: apex partis petrosae ossis temporalis. (05 Mar 2000) |
| apex patellae | The pointed lower end of the patella from which the ligamentum patellae passes to insert on the tibial tuberosity. Synonym: apex patellae. (05 Mar 2000) |
| apex pneumonia | Apical pneumonia, pneumonia of the apex or apices. (05 Mar 2000) |
| apex prostatae | The lowermost part of the prostate, situated above the urogenital diaphragm. Synonym: apex prostatae. (05 Mar 2000) |
| apex pulmonis | The rounded, upper extremity of each lung that extends into the cupula of the pleura. Synonym: apex pulmonis. (05 Mar 2000) |
| apex radicis dentis | The tip of a tooth root, the part farthest from the incisal or occlusal side. Synonym: apex radicis dentis, root apex, root tip. (05 Mar 2000) |
| apex satyri | A point projecting upward and posteriorly from the free outcurved margin of the helix a little posterior to its upper end. Synonym: apex auriculae, apex satyri, Woolner's tip. (05 Mar 2000) |