13-Letter Words Containing: RU

• a group of viruses including those causing mumps and measles

• A group of four things.

• a group of four men

• any four copies; any of four things that correspond to one another exactly

• having four units or components

• reproduce fourfold

• the branch of philosophy concerned with the law and the principles that lead courts to make the decisions they do

• the collection of rules imposed by authority

• the act of making a piece of equipment rugged (strengthening to resist wear or abuse)