| microtome | <instrument> A device used for cutting sections from an embedded specimen, either for light or electron microscopy. (18 Nov 1997) |
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| Risley's rotary prism | A prism with a circular base that is rotated in a metal frame marked with a scale; used in examination of ocular muscle imbalance. (05 Mar 2000) |
| rotary joint | A synovial joint in which a section of a cylinder of one bone fits into a corresponding cavity on the other, as in the proximal radioulnar joint. Synonym: articulatio trochoidea, helicoid ginglymus, lateral ginglymus, rotary joint, rotatory joint, trochoid articulation, trochoid joint. (05 Mar 2000) |
| rotary subluxation of scaphoid | <radiology> Scaphoid ring sign, Terry Thomas sign (scapho-lunate dissociation) (12 Dec 1998) |