having no roof.
without the shelter of a house:
noun 1. the outline of a rooftop.
- Roof of fourth ventricle
roof of fourth ventricle n. The roof of the fourth ventricle formed by the inferior and the superior medullary vela.
- Roof of tympanum
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.