district of London, so called because it was laid out by four brothers of a family named Adam, from Greek adelphos "brother," literally "from the same womb," from copulative prefix a- "together with" + delphys "womb," perhaps related to dolphin. The district was the site of a popular theater c.1882-1900, which gave its name to a style of performance.
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Historical Examples of adelphia
Adelphous (stamens), joined in a fraternity (adelphia); see monadelphous, &c.The Elements of Botany