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tetracycline

(Encyclopedia)tetracycline tĕˌtrəsīˈklēn [key], any of a group of antibiotics produced by bacteria of the genus Streptomyces. Effective against a wide range of Gram positive and Gram negative bacteria, tetrac...

yew

(Encyclopedia)yew, name for evergreen trees or shrubs of the genus Taxus, somewhat similar to hemlock but bearing red berrylike fruits instead of true cones. Of somber appearance, with dark green leaves, the yew si...

Scott-Heron, Gil

(Encyclopedia)Scott-Heron, Gil, 1949–2011, American poet, musician, and songwriter, b. Chicago. Often considered “the godfather of rap music,” he rejected that ...

rotavirus

(Encyclopedia)rotavirus, double-stranded RNA virus, genus Rotavirus, with a wheellike appearance that can cause severe watery diarrhea and vomiting, sometimes leading to severe dehydration and death. The virus is t...

Prince

(Encyclopedia)Prince, 1958–2016, American singer and songwriter, b. Minneapolis, Minn., as Prince Rogers Nelson. Biracial, slim, and sexily androgynous, he was an electrifying performer who composed hundreds of s...

Helen

(Encyclopedia)Helen, in Greek mythology, the most beautiful of women; daughter of Leda and Zeus, and sister of Castor and Pollux and Clytemnestra. While still a young girl Helen was abducted to Attica by Theseus an...

vasectomy

(Encyclopedia)vasectomy, male sterilization by surgical excision of the vas deferens, the thin duct that carries sperm cells from the testicles to the prostate and the penis. Vasectomy is a popular method of birth ...

aloe

(Encyclopedia)aloe ălˈō [key] [Gr.], any species of the genus Aloe, succulent perennials of the family Lilaceae (lily family), native chiefly to the warm dry areas of S Africa and also to tropical Africa, but cu...

homelessness

(Encyclopedia)homelessness, the condition of not having a permanent place to live, widely perceived as a societal problem only beginning in the 1980s. Figures for the number of homeless people in the United States ...

Joplin, Janis

(Encyclopedia)Joplin, Janis jŏpˈlĭn [key], 1943–70, American blues-rock singer, b. Port Arthur, Tex. After dropping out of college (1963) and singing folk rock in Texas clubs, she moved (1966) to San Francisco...