| hexagon | <geometry> A plane figure of six angles. Regular hexagon, a hexagon in which the angles are all equal, and the sides are also all equal. Origin: L. Hexagonum, Gr. Six-cornered; six (akin to E. Six) + angle. Source: Websters Dictionary (01 Mar 1998) |
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| roche alum | <chemistry> A kind of alum occuring in small fragments; so called from Rocca, in Syria, whence alum is said to have been obtained; also called rock alum. Source: Websters Dictionary (01 Mar 1998) |
| roche moutonnee | <geology> See Sheepback. Origin: F, sheep-shaped rock. Source: Websters Dictionary (01 Mar 1998) |
| tripe-de-roche | <botany> Same as Rock tripe, under Rock. Origin: F. Source: Websters Dictionary (01 Mar 1998) |