aristotype

from The Century Dictionary.

• noun A photograph printed on paper on which silver salts are spread with collodion or gelatin. The name was originally given by Liesegang to the gelatinochlorid or collodiochlorid printing-out process.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Photog.) Orig., a printing-out process using paper coated with silver chloride in gelatin; now, any such process using silver salts in either collodion or gelatin; also, a print so made.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A high-symmetry crystallographic structure type that can be viewed as an idealized version of a lower-symmetry structure
• noun obsolete A printing process using paper coated with silver chloride in gelatin