Meaning of Sinus Sabaeus

Si•nus Sa•bae•us

Pronunciation: (sē'nus sa-bē'us, sī'-), [key]
  1. an area in the southern hemisphere and near the equator of Mars, appearing dark when viewed telescopically from the earth.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.