| Webster's Online Dictionary |
| Part of Speech | Definition | |
| Expression | 1. (Geol.), a hard and coarse, gritty sandstone, dividing the Carboniferous from the Subcarboniferous strata.[Websters]. | |
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| Expressions | Definition | ||
| Millstone girt | (Geol.), a hard and coarse, gritty sandstone, dividing the Carboniferous from the Subcarboniferous strata. Source: Webster's Revised Unabridged Dictionary. | ||
Source: compiled by the editor from various references; see credits. | Top | ||