Arsenic is a chemical element that's quite poisonous to humans and other animals. Arsenic was once commonly used in rat poison and insecticides.
One of the elements, a solid substance resembling a metal in its physical properties, but in its chemical relations ranking with the nonmetals. It is of a steel-gray color and brilliant luster, though usually dull from tarnish. It is very brittle, and sublimes at 356° Fahrenheit. It is sometimes found native, but usually combined with silver, cobalt, nickel, iron, antimony, or sulphur. Orpiment and realgar are two of its sulphur compounds, the first of which is the true arsenticum of the ancients. The element and its compounds are active poisons. Specific gravity from 5.7 to 5.9. Atomic weight. Symbol As.
Noun
 a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar
Noun
 a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide and weed killer
n.
 One of the elements, a solid substance resembling a metal
   in its physical properties, but in its chemical relations ranking with
   the nonmetals. It is of a steel-gray color and brilliant luster, though
   usually dull from tarnish. It is very brittle, and sublimes at 356¡
   Fahrenheit. It is sometimes found native, but usually combined with
   silver, cobalt, nickel, iron, antimony, or sulphur. Orpiment and
   realgar are two of its sulphur compounds, the first of which is the
   true arsenicum of the ancients. The element and its compounds are
   active poisons. Specific gravity from 5.7 to 5.9. Atomic weight 75.
   Symbol As.
n.
 Arsenious oxide or arsenious anhydride; -- called also
   arsenious acid, white arsenic, and ratsbane.
a.
 Pertaining to, or derived from, arsenic; -- said of those
   compounds of arsenic in which this element has its highest equivalence;
   as, arsenic acid.
Arsenic
Arsenic
One of the elements, a solid substance resembling a metal in its physical properties, but in its chemical relations ranking with the nonmetals. It is of a steel-gray color and brilliant luster, though usually dull from tarnish. It is very brittle, and sublimes at 356° Fahrenheit. It is sometimes found native, but usually combined with silver, cobalt, nickel, iron, antimony, or sulphur. Orpiment and realgar are two of its sulphur compounds, the first of which is the true arsenticum of the ancients. The element and its compounds are active poisons. Specific gravity from 5.7 to 5.9. Atomic weight. Symbol As.
Pertaining to, or derived from, arsenic; -- said of those compounds of arsenic in which this element has its highest equivalence; 
Usage Examples
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