Source : Webster's Revised Unabridged Dictionary (1913)

Oblongum \Ob*lon"gum\, n.; pl. {Oblonga}. [NL. See {Oblong}.]
   (Geom.)
   A prolate spheroid; a figure described by the revolution of
   an ellipse about its greater axis. Cf. {Oblatum}, and see
   {Ellipsoid of revolution}, under {Ellipsoid}.