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Ac symbol of the chemical element actinium.
actinium a radioactive chemical element of the rare-earth group that has eighty-nine protons in each nucleus. (symbol: Ac)
affix in grammar, a word element that, when added to a word, modifies its meaning or function; prefix, infix, or suffix. [1/5 definitions]
Ag symbol of the chemical element silver.
Al symbol of the chemical element aluminum.
allotrope one of several forms in which a chemical element may exist.
alloy to degrade the purity of by the addition of some element; adulterate. [1/5 definitions]
aluminum a chemical element that has thirteen protons in each nucleus, occurs commonly in ores such as bauxite, and in pure form is a strong lightweight corrosion-resistant silvery metal with many industrial uses. (symbol: Al)
Am symbol of the chemical element americium.
americium a synthetic radioactive chemical element that has ninety-five protons in each nucleus. (symbol: Am)
animus In Jungian psychology, the archetypal masculine element in a woman's psyche. [1/3 definitions]
antimony a chemical element that has fifty-one protons in each nucleus and forms a brittle bluish white metal crystal, used in hard alloys, electrical components, and medicines. (symbol: Sb)
Ar symbol of the chemical element argon.
arch1 a structural element, usu. of masonry, that is curved and used to span an open space such as a door. [2/5 definitions]
argon a chemical element of the inert gas group that has eighteen protons in each nucleus. (symbol: Ar)
arsenic a poisonous chemical element that has thirty-three protons in each nucleus and occurs in brittle, grayish white crystalline masses or in yellow or black allotropes. (symbol: As) [1/2 definitions]
As symbol of the chemical element arsenic.
aspect an element or part. [1/5 definitions]
astatine a highly radioactive chemical element of the halogen group that has eighty-five protons in each nucleus. (symbol: At)
At symbol of the chemical element astatine.
atom an invisible component of any element, consisting of protons, neutrons, and electrons, once considered the smallest possible unit of matter. [1/2 definitions]