Semidome :: Semidome (n.) A roof or ceiling covering a semicircular room or recess, or one of nearly that shape, as the apse of a church, a niche, or the like. It is approximately the quarter of a hollow sphere..
Semidouble :: Semidouble (n.) An office or feast celebrated with less solemnity than the double ones. See Double, n., 8..
Semidouble :: Semidouble (a.) Having the outermost stamens converted into petals, while the inner ones remain perfect; -- said of a flower..