1. Is the eighteenth letter of the alphabet, and one of the liquids or semi-vowels. As a numeral, it stands for 80; and with a dash over it, for 80,000.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• rl,
• rs,
• rt,
• gr,
• vr,
• wr,
• r,
• tr,
• xr,
• rk,
• rg,
• ry,
• rr,
• lr,
• qr,
• rp,
• rm,
• rw,
• nr,
• 3r

• ri,
• RAO,
• row,
• roe,
• Roy,
• Rey,
• Rea,
• RAU,
• ray,
• Rei,
• ROA,
• ru,
• re,
• rye,
• rh,
• Rew,
• rho,
• rya,
• Ria,
• rue,
• ro,
• R-2,
• raw,
• Rae,
• ra,
• Ree,
• rio.

The adjective form of the word "R" is "R-like".