stadium

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Adjectives:

annular, bead-like, bell-shaped, belted, bulbiform, bulbous, campaniform, campaniliform, campanulate, circinate, circular, circumrotatory, columnar, conic, conical, coniform, cycloidal, cyclostomate, cylindric, cylindrical, cylindroid, egg-shaped, elliptic, elliptical, full-orbed, fungiform, gibbous, gimmal, globated, globose, globous, globular, guttiform, gyratory, knobbed, lobed, lumbriciform, molendinaceous, moniliform, obconic, obrotund, ooid, orbicular, oval, ovate, oviform, ovoid, ovopyriform, pear-shaped, penannular, peristrephic, pyriform, ringed, rotary, rotating, rotatory, rotund, round, rounded, spherical, spheroidal, stobic, strobic, strombuliform, trochiform, trochilic, vertiginous, vortical, vorticose