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The Collaborative International Dictionary of English v.0.48 (gcide)

Foliation \Fo"li*a"tion\, n. [Cf. F. foliation.]
1. The process of forming into a leaf or leaves.
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2. The manner in which the young leaves are dispo?ed within
the bud.
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The . . . foliation must be in relation to the stem.
--De Quincey.
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3. The act of beating a metal into a thin plate, leaf, foil,
or lamina.
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4. The act of coating with an amalgam of tin foil and
quicksilver, as in making looking-glasses.
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5. (Arch.) The enrichment of an opening by means of foils,
arranged in trefoils, quatrefoils, etc.; also, one of the
ornaments. See {Tracery}.
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6. (Geol.) The property, possessed by some crystalline rocks,
of dividing into plates or slabs, which is due to the
cleavage structure of one of the constituents, as mica or
hornblende. It may sometimes include slaty structure or
cleavage, though the latter is usually independent of any
mineral constituent, and transverse to the bedding, it
having been produced by pressure.
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