qr.

abbr. quarter(s).

* * *

pl. qrs.

1. farthing. [ < L quadrans, pl. quadrantes]

2. quarter.

3. quire.

* * *

qr.,

1. farthing (Latin, quadrans).

2. quarter; one fourth of a hundredweight.

3. quire.

QR (no periods),

Chess. queen's rook.