trap rock
Trap Trap, n. [Sw. trapp; akin to trappa stairs, Dan. trappe, G. treppe, D. trap; -- so called because the rocks of this class often occur in large, tabular masses, rising above one another, like steps. See {Tramp}.] (Geol.) An old term rather loosely used to designate various dark-colored, heavy igneous rocks, including especially the feldspathic-augitic rocks, basalt, dolerite, amygdaloid, etc., but including also some kinds of diorite. Called also {trap rock}. [1913 Webster]

{Trap tufa}, {Trap tuff}, a kind of fragmental rock made up of fragments and earthy materials from trap rocks. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Trap rock — is a form of plutonic igneous rock that tends to form polygonal vertical fractures, most typically hexagonal, but also four to eight sided. The fracture pattern forms when magma of suitable chemical composition (typically basaltic) intrudes as a… …   Wikipedia

  • trap|rock — «TRAP ROK», noun. = trap3. (Cf. ↑trap) …   Useful english dictionary

  • trap rock — n. TRAP2 * * * …   Universalium

  • trap rock — n. TRAP2 …   English World dictionary

  • Trap — Trap, n. [Sw. trapp; akin to trappa stairs, Dan. trappe, G. treppe, D. trap; so called because the rocks of this class often occur in large, tabular masses, rising above one another, like steps. See {Tramp}.] (Geol.) An old term rather loosely… …   The Collaborative International Dictionary of English

  • Trap tufa — Trap Trap, n. [Sw. trapp; akin to trappa stairs, Dan. trappe, G. treppe, D. trap; so called because the rocks of this class often occur in large, tabular masses, rising above one another, like steps. See {Tramp}.] (Geol.) An old term rather… …   The Collaborative International Dictionary of English

  • Trap tuff — Trap Trap, n. [Sw. trapp; akin to trappa stairs, Dan. trappe, G. treppe, D. trap; so called because the rocks of this class often occur in large, tabular masses, rising above one another, like steps. See {Tramp}.] (Geol.) An old term rather… …   The Collaborative International Dictionary of English

  • Trap — Trap, a. Of or pertaining to trap rock; as, a trap dike. [1913 Webster] …   The Collaborative International Dictionary of English

  • trap — 1. n. & v. n. 1 a an enclosure or device, often baited, for catching animals, usu. by affording a way in but not a way out. b a device with bait for killing vermin, esp. = MOUSETRAP. 2 a trick betraying a person into speech or an act (is this… …   Useful english dictionary

  • Rock N Roll McDonald's — Not to be confused with the song by Wesley Willis …   Wikipedia

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