(physics, figuratively) Any half of a roughly spherical-like object; any dome-shaped object.

(rare, colloquial, especially with "on the") Inexpensive; not overpriced.

A method of casting metal used mainly for small pieces requiring relatively high accuracy.

An abalone or its shell.

(figuratively) A stunning shock. / (uncountable) A psychiatric condition characterized by fatigue caused by battle. / A person with the condition.

To stun or debilitate as by a shock.

(biology, of the embryo in an egg) That has partially developed but died without hatching.

(dated) Stunned or mentally unbalanced by prolonged stress such as experienced in combat or under fire (shell-fire); suffering from post-traumatic stress disorder.

simple past tense and past participle of shell shock

An East Asian plant related to ginger, Alpinia zerumbet, grown for its showy flowers, which are shell-pink on the outside and intensely orange and red on the inside.