roof of tympanum n.
The roof of the middle ear, formed by the thinned anterior surface of the petrous portion of the temporal bone.
- Roof plate
roof plate or roofplate n. The thin layer of the embryonic neural tube that connects the lateral plates dorsally.
noun, Optics. 1. Amici prism. noun, Optics. 1. a compound prism that spreads out incident white light into a spectrum but produces no deviation of the central color of the dispersed beam.
noun 1. a black rat, Rattus rattus alexandrinus, often found on the upper floors of buildings in warm areas.
noun, plural roofs. 1. the external upper covering of a house or other building. 2. a frame for supporting this: an open-timbered roof. 3. the highest part or summit: The Himalayas are the roof of the world. 4. something that in form or position resembles the roof of a house, as the top of a […]