bluestone
A hard, fine-grained, commonly feldspathic and micaceous sandstone or siltstone of dark greenish to bluish gray color that splits readily […]
General
blue stain
A dark stain in the sapwood of some species of trees, usually caused by a fungus; it does not weaken
General
blue print
A reproduction of a drawing by means of a contact printing process on lightsensitive paper, producing a negative image consisting
General
blue lias lime
(Brit.) A hydraulic lime obtained by burning blue lias limestone. When mixed with water, it has a set which is
General
blue brick, sewer brick, Staffordshire blue
A brick of high strength whose blue color results from firing in a kiln in a flame of low oxygen