One of the mysteries of the English language finally explained.
In a crystal or crystal structure: a plane or face which intersects one of the crystal axes and is parallel to the other two. Also: a crystal form or solid figure containing two such planes or faces parallel to each other.
Of the nature of a pinacoid; parallel to the two axes that it does not intersect.
Mid 19th century; earliest use found in James Nicol (1810–1879), geologist. From ancient Greek πινακ-, πίναξ pinax + -oid. With the adjective compare earlier pinacoidal and also Portuguese pinacóide.
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