plural of close helm

(historical) A helmet that entirely covers the head, including the face.

A hard, protective head covering, typically part of armour. / The upper part of a chemist's retort. / The hood-shaped upper sepal or petal of some flowers, as of the monkshood or the snapdragon.

(transitive) To cover with, or as if with, a helmet.

A container with an open hole or neck containing a column of compressible fluid (gas) and frequently used to attenuate a certain frequency, as to eliminate noise.

A lightweight helmet-shaped hat made of the pith of the sola or shola (Indian spongewood) plant covered with white cotton and faced with green cloth. Also known as a "sola topi", it was originally used by the British army in India in the 19th century, later used more widely.

(physics) one of a pair of flat coils, having equal numbers of turns and equal diameters, arranged on a common axis and connected in series; used to obtain a nearly uniform magnetic field without the use of a long solenoid

plural of pith helmet

(nautical) A member of a ship's crew who is responsible for steering. / (figuratively) A leader.

plural of helmet