impres's ion

[L. impre io; imprimere, to pre in.] 1. structure or organ upon another; see impre io. 2. external object acting through the organs of sense. 3 An imprint of the jaw, teeth (if present), and roof. of the mouth, made in wax or other plastic material, used as a mould for a plaster cast of the mouth, dig'itate i., one of the depre ions on the upper surface of the orbital plates of the frontal bone, in the anterior cranial fo a, alternating with elevations, the juga cerebral i a. mater'nal a strong emotion or shock, experienced by a pregnant woman, supposed to be the cause of a malformation or surface marking of the fetus; also this lesion or malformation supposed to result from the mental impre ion of the mother.