R's

noun pl. R's, r's

1. the eighteenth letter of the English alphabet: from the Greek rho, a borrowing from the Phoenician
2. any of the speech sounds that this letter represents, as, in English, the (r) of rude
3. a type or impression for r or R
4. the eighteenth in a sequence or group
5. an object shaped like

adjective

1. of r or R
2. eighteenth in a sequence or group
3. shaped like