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| ratio of the volume of the pores of a substance to the total volume of the mass |
| capability of a porous rock or sediment to permit the flow of fluids through its pore spaces |
| terrain (təˈreɪn, ˈtɛreɪn) | |
| —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] | |