(Scotland, dialect, obsolete) A pencil of black lead.

plural of eraser pen

(animal husbandry) A passage of fence with one narrow end that is used to handle large domestic animals, such as cattle or sheep.

plural of crush pen

plural of bow pen

bow compasses, one leg of which carries a pen

A device for the storage of charged particles using a homogeneous static magnetic field and a spatially inhomogeneous static electric field.

plural of Penning trap

plural of sea pen

A colonial marine cnidarian of the order Pennatulacea.