spheroid Syllabification: (sphe·roid)Pronunciation: /ˈsfi(ə)rˌoid/Definition of spheroid noun a spherelike but not perfectly spherical body. a solid generated by a half-revolution of an ellipse about its major axis ( prolate spheroid) or minor axis ( oblate spheroid). Derivatives spheroidalPronunciation: /sfiˈroidl/ adjective spheroidicityPronunciation: /ˌsfi(ə)roiˈdisitē/ noun spheroid in other Oxford dictionaries Definition of spheroid in the British & World English dictionary