A medical condition which can affect the feet when they are constantly cold and wet, similar to frostbite.

A pair of binoculars consisting of two periscopes.

plural of trench club

An improvised hand-held weapon used by raiding parties in World War One

The phenomenon of a fire rushing quickly up an inclined surface, due to a combination of the Coandă effect (which causes the fire to hug the inclined surface) and flashover (where the surface of a space near the fire — in this case the surface of the more elevated regions of the incline — is heated until it self-ignites).

plural of trench coat

(idiomatic, medicine) Acute necrotizing ulcerative gingivitis, a severe bacterial infection of the gums, typically characterized by inflammation, bleeding, deep ulceration, necrotized tissue, pain, fever, enlarged lymph nodes, fatigue, and halitosis.

plural of trench mortar

A small mortar designed to fire shells from one trench to an enemy trench.

A knife designed for use in hand-to-hand fighting in trenches, typically having a double-edged blade and a knuckleduster on the handle.