• (astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day
• a United States territory on the eastern part of the island of Samoa
• a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and in various alloys; found in arsenopyrite and orpiment and realgar
• A support person, usually female, who may not have medical or midwifery training, who provides emotional and practical assistance to a pregnant mother or couple before, during or after childbirth.
• (baseball) a measure of a pitcher's effectiveness; calculated as the average number of earned runs allowed by the pitcher for every nine innings pitched
• a period marked by distinctive character or reckoned from a fixed point or event
• a major division of geological time; an era is usually divided into two or more periods
• excessive development of the breasts in males; usually the result of hormonal imbalance or treatment with certain drugs (including some antihypertensives)
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