Emily Dickinson Lexicon

SA'MI-EL, or SI-MOOM', n. [Ar. سموم, samom. The Ar. سَهَمَ sahama, signifies to be thin, or to become thin or pale, and to suffer the heat of the simoom, and سَمَّ samma, signifies to poison. This word signifies probably that which is deleterious or destructive.]

A hot and destructive wind that sometimes blows in Arabia.