(idiomatic) Completely full; packed

The ordered arrangement of objects such as to create the greatest density (e.g. of atoms in a crystal).

Full of action; dramatic and exciting.

plural of pack ice

(medicine, smoking) A unit for measuring the number of cigarettes a person has smoked previously; it is calculated by multiplying the average number of packs of cigarettes the person smokes per day by the number of years the person has smoked.

(medicine, informal) Packed red blood cells: red blood cells that have been separated for blood transfusion.

plural of pack-up

plural of packing plant

A manufacturing warehouse where products are prepared for shipping and handling.

(mathematics) The arranging of non-overlapping spheres in space