Obtuse. Not pointed; bent.
Orbit. The path made by a heavenly body in its travel around another body.
Ordinate. The distance of any point in a curve or a straight line, measured on a line called the axis of ordinates, or on a line parallel to it from another line, at right angles thereto, called the axis of abscissas.
Ornamentation. To embellish; to improve in appearance.
Oscillate. To swing like a pendulum.
Overhang. In a general sense that which projects out.
Paneling. A sunken compartment or portion with raised margins, molded or otherwise, as indoors, ceilings wainscoting, etc.
Parallelogram. A right-lined quadrilateral figure, whose opposite sides are parallel and, consequently, equal.
Parallel. Extended in the same direction, and in all parts equally distant.
Perspective. A view; a vista; the effect of distance upon the appearance of objects, by means of which the eye recognizes them as being at a more or less measurable distance.