Don't Avoid the V: VACUA and VACUUM

There are a few worrds that mwean empty space, and have the prefix VAC. These words don't have anything to do with the cow (VACA, which gave its name to VACCINE, VACCINA., VACCINIA, etc).

VACUA: a pluralization of VACUUM

VACUUM: a space enirely devoid of matter. Pluralized VACUUMS

There is also :

VACUITY - an empty space
VACUOLE - a small cavity in human tissue
VACUOUS - empty, brainless ("He had a vacuous express on his face")

They all come from the Latin, "vacuus" - for empty.