Sorry, no definitions found. Check out and contribute to the discussion of this word!
Sorry, no etymologies found.
The solid portion of the tooth consists of (1) the ivory or dentin, which forms the bulk of the tooth; (2) the enamel, which covers the exposed part of the crown; and (3) a thin layer of bone, the cement or crusta petrosa, which is disposed on the surface of the root.
The crusta petrosa or cement (substantia ossea) is disposed as a thin layer on the roots of the teeth, from the termination of the enamel to the apex of each root, where it is usually very thick.
In the thicker portions of the crusta petrosa, the lamellæ and Haversian canals peculiar to bone are also found.
Nam Christus ipse Matt.xiii. 20 et Luc.viii. 13 ac deinceps, triplex praeterea inter temporarios et veros fideles discrimen manifesto constituit, quum illos dicit semen recipere in terra petrosa, hos in terra bona, seu corde bono: illos carere radice, hos radicem firmam habere: illos fructibus esse vacuos, hos fructum suum diversa mensura, constanter seu perseveranter proferre.
Dr. SWARTZ, in his Observations on the Plants of the West-Indies, informs us, that this species grows wild in Jamaica, where (_incolit calcareosa petrosa_) it inhabits calcareous rocky places , forms a small tree about the height of six feet, and flowers from the middle of