(aviation, ship-building) A curve indicating the shape of an airfoil or nautical equivalent in a vertical plane parallel to the longitudinal axis of the craft or vessel.

(anatomy, relational) Of or pertaining to the Eustachian tube and the pharynx. / (anatomy, relational) Relating to the salpingopharyngeus.

(colloquial) Approaching; about; roughly.

(mathematics) An important statement about surfaces in differential geometry, connecting their geometry (in the sense of curvature) to their topology (in the sense of the Euler characteristic).