a hard, semi-metamorphosed limestone obtained from Purbeck, used in building and paving; (also) a paving stone made of Purbeck stone.

Of or pertaining to the region or district of Tibur (now Tivoli) in ancient Latium. Tiburtine stone = travertine, n.: cf. tiber-stone, n.

Usually toph stone: Travertin, or other soft stone: = tophus, n. 1.

A white or light-coloured concretionary limestone, formed by the precipitation of calcium carbonate from springs, or from ground or surface water…

= Purbeck stone n. at sense 1a.

Purbeck stone, esp. in a polished form for ornamental use.

Portland stone; Portland cement.

A calcareous stone quarried at Tibur, now Tivoli; travertine: cf. Tiburtine, adj.

= travertine, n.

Used attributively and absol. to designate a pale brownish- or greyish-white carboniferous limestone used for building and decorative purposes.

A bed of white limestone in the upper Jurassic strata of southern England; a variety of Portland stone obtained from this bed. Frequently attributive…