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Webster 1913 Edition

Adj.

[L.

petra

rock, stone, Gr.

πέτρα

Petrifying; converting into stone;

as,

petrescent

water

Boyle.

Adj.

[Gr. a stone; L. petra.]

Converting into stone; changing into stony hardness.

petrescent ‎(not comparable)

Petrifying; converting into stone.
(Can we find and add a quotation of Boyle to this entry?)