Arsenic

adj. pertaining to arsenic, containing arsenic (poisonous chemical element)

n. poisonous chemical element

Noun
1. 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
(synonym) As, atomic number 33
(hypernym) chemical element, element
(substance-holonym) herbicide, weedkiller, weed killer
2. a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide and weed killer
(synonym) arsenic trioxide, arsenous anhydride, arsenous oxide
(hypernym) trioxide

adj. arsenic, arsenical

n. arsenic, poisonous chemical element

(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.
  

noun
chemical element which forms poisonous compounds, such as arsenic trioxide, and which was once used in some medicines
(NOTE: chemical symbol is As)