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

Alternative form of shell-shocked

simple past tense and past participle of shell shock

(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.

Alternative form of fallout shelter

A thick-walled building, usually under the ground, built so that people can keep away from dust after a nuclear explosion.

plural of shear wave

(physics) A wave that changes the medium through which it travels to change its shape but not its volume or density.

present participle of shellac