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We find the angular diameter of R Doradus to be 57 +/- 5 mas, exceeding thatof Betelgeuse and implying that R Dor is larger in apparent size than everystar except the Sun. R Dor is shown to be closely related to the Miravariables. We estimate an effective temperature of 2740 +/- 190 K, a distanceof 61 +/- 7 pc, a luminosity of 6500 +/- 1400 Lsol and a radius of 370 +/- 50Rsol. The characteristics of R Dor are consistent with it being near the edgeof a Mira instability strip. We detect non-zero closure phases from R Dor,indicating an asymmetric brightness distribution. We also observed W Hya, asmall-amplitude Mira, for which we find an angular diameter of 44 +/- 4 mas.Comment: MNRAS (accepted); 7 pages, LaTeX with necessary style file and  PostScript figure

The angular diameter of R Doradus: a nearby Mira-like star