ter·rain

[tuh-reyn]
noun
1.
a tract of land, especially as considered with reference to its natural features, military advantages, etc.
2.
Geology, terrane.

Origin:
1720–30; < FrenchVulgar Latin *terrānum, noun use of neuter of *terrānus of land. See terra, -an

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World English Dictionary
terrain (təˈreɪn, ˈtɛreɪn) [Click for IPA pronunciation guide]
 
n
1.  ground or a piece of ground, esp with reference to its physical character or military potential: radio reception can be difficult in mountainous terrain; a rocky terrain
2.  a variant spelling of terrane
 
[C18: from French, ultimately from Latin terrēnum ground, from terra earth]

00:10
Terrain is always a great word to know.
So is porosity. Does it mean:
thin, distinctive stratum useful for stratigraphic correlation
ratio of the volume of the pores of a substance to the total volume of the mass
terrane or terrain (ˈtɛreɪn) [Click for IPA pronunciation guide]
 
n
1.  a series of rock formations, esp one having a prevalent type of rock
2.  an allochthonous, fault-bounded section of the earth's crust
 
[C19: see terrain]
 
terrain or terrain
 
n
 
[C19: see terrain]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

terrain
1727, "ground for training horses," from Fr. terrain "piece of earth, ground, land," from O.Fr. (12c.), from V.L. *terranum, from L. terrenum "land, ground," from neut. of terrenus "of earth, earthly," from terra "earth, land," lit. "dry land" (as opposed to "sea"); from PIE base *ters- "to dry" (cf.
Skt. tarsayati "dries up," Avestan tarshu- "dry, solid," Gk. teresesthai "to become or be dry," L. torrere "dry up, parch," Goth. þaursus "dry, barren," O.H.G. thurri, Ger. dürr, O.E. þyrre "dry;" O.E. þurstig "thirsty"). Meaning "tract of country, considered with regard to its natural features" first attested 1766.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They cannot, for example, cross rocky terrain or ravines.
Help is often far away, and big swaths of remote, rugged terrain present many
  opportunities for disorientation.
The terrain images had been previously captured with aerial photography and
  digitally stored.
The ocean floor isn't, it turns out, the weirdest terrain a lobster has to
  navigate.
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