What is the meaning of Barrer?

One who or that which bars.

A non-SI unit of gas permeability.

to bar, bar up (to lock or bolt with a bar)

to bar off

to cross out, strike out (put written lines through written text, to show it is erroneous)

to go away, to leave, to fuck off

to lock (a door etc.; not necessarily with a bar)

to sweep

indefinite plural of barre

to sweep

Source: wiktionary.org