a. [ See Petrous. ] (Anat.)
Petrosal bone (Anat.),
n. (Anat.)
n. [ Petro + silex. ] (Min.) Felsite. [ 1913 Webster ]
a. Containing, or consisting of, petrosilex. [ 1913 Webster ]
n. [ Petro + stearine. ] A solid unctuous material, of which candles are made. [ 1913 Webster ]