| drift surface | <radiobiology> Surface on which the guiding centre of a particle is constrained to move, due to the effects of the laws of adiabatic invariance on its drift motion. (09 Oct 1997) |
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| immunoglobulins, surface | Immunoglobulins bound to the surface of lymphocytes. (12 Dec 1998) |
| incisal surface | The part of an anterior tooth farthest from the apex of the root. Synonym: margo incisalis, cutting edge, incisal margin, incisal surface, shearing edge. (05 Mar 2000) |
| inferior articular surface of tibia | The quadrilateral surface on the distal end of the tibia for articulation with the talus; it is concave anteroposteriorly and broader anteriorly. Synonym: facies articularis inferior tibiae. (05 Mar 2000) |
| inferior cerebral surface | The inferior surface of the brain visible when seen from below. Synonym: facies inferior cerebri, basis cerebri, inferior cerebral surface. (05 Mar 2000) |
| inferior surface of cerebellar hemisphere | It rests in the posterior cranial fossa and overlies the medulla; it includes the semilunaris inferior, biventer lobule, cerebellar tonsil, and flocculus. Synonym: facies inferior hemispherii cerebelli. (05 Mar 2000) |
| inferior surface of pancreas | The surface of the body of the pancreas that faces downward. Synonym: facies inferior pancreatis. (05 Mar 2000) |
| inferior surface of petrous part of temporal bone | Inferior surface of petrous part of the temporal bone; the portion of the petrous part of the temporal bone that contributes to the external base of the skull. Synonym: facies inferior partis petrosae ossis temporalis. (05 Mar 2000) |
| inferior surface of tongue | The surface of the tongue that faces the floor of the oral cavity, its mucosa being thin, smooth and devoid of papillae. Synonym: facies inferior linguae. (05 Mar 2000) |
| inferolateral surface of prostate | The surface of the prostate facing the body of the pubis and the pelvic diaphragm. Synonym: facies inferolateralis prostatae. (05 Mar 2000) |
| interfacial surface tension | The tension or resistance to separation possessed by the film of liquid between two well-adapted surfaces, as of the thin film of saliva between the denture base and the tissues. (05 Mar 2000) |
| internal surface | The internal concave surface of either the frontal or the parietal bone. Synonym: facies interna. (05 Mar 2000) |
| internal surface of frontal bone | The surface of the frontal bone that contributes to the wall of the cranial cavity. Synonym: facies interna ossis frontalis. (05 Mar 2000) |
| internal surface of parietal bone | The concave surface of the parietal bone forming part of the wall of the cranial cavity. Synonym: facies interna ossis parietalis. (05 Mar 2000) |
| intestinal surface of uterus | The posterosuperior surface of the uterus with which loops of intestine come in contact. Synonym: facies intestinalis uteri. (05 Mar 2000) |