[′fish·ər ə′lip‚sȯid əv ¦nīn‚tēn ′siks·tē] (geodesy) The reference ellipsoid of which the semimajor axis is 6,378,166.000 meters, the semiminor axis is 6,356,784.298 meters, and the flattening or ellipticity is 1/298.3. Also known as Fischer spheroid of 1960.