Ghost story by M. R. James published in 1904, about a mysterious whistle found on a beach in Suffolk.
On the Choice of a Wife
Essay by H. G. Wells first published in 1895, offering advice to young men on choosing a wife.
Ophelia
Series of three paintings by John William Waterhouse, reflecting his interpretation of Ophelia, a character from Shakespeare's Hamlet
Ordinance of Labourers 1349
Largely ineffective royal proclamation intended to address the acute labour shortage in the wake of the Black Death.
Ordish–Lefeuvre system
Early form of suspension bridge design.
Ordsall Hall
Large former manor house in the historic parish of Ordsall, Lancashire, England, now part of the City of Salford, in Greater Manchester.
Organotherapy
Technique that makes use of extracts derived from animal or human tissues to treat medical conditions.
Orgone
Widely discredited theory of universal life energy developed by the Austrian psychiatrist Wilhelm Reich (1897–1957).
Orgonomy
Redirected to orgone.
Osculum infame
Ritual of a witch paying homage to the Devil by kissing his genitals, anus or feet.
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