In geometry a conoid is a ruled surface, whose rulings fulfill the additional conditions: All rulings are parallel to a plane, the directrix plane.
Wikipedia
A ruled surface, whose rulings fulfill the additional conditions that ① all rulings are parallel to a plane and ② all rulings intersect a fixed line
Wikidata
A three-dimensional figure whose base is a circle and whose shell tapers to a point.
OmegaWiki
A Catalan surface all of whose rulings intersect some fixed line.
Wiktionary
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