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A lenticular galaxy is a disk galaxy (shaped like a disk) that has no spiral arms, i.e., that is not a spiral galaxy. The word lenticular means "shaped like a lens" (which is like a lentil). The Hubble galaxy classification S0 indicates a lenticular galaxy, which are sometimes referred to as S0 galaxies. They often have a substantial central bulge. Their typical properties are much like elliptical galaxies: substantial cosmic dust, limited star formation, and aging stars.