(uncountable) The result of having been worn away or eroded, as by a glacier on rock or the sea on a cliff face.

A mass (especially Catholic) to honor and remember a dead person. / A musical composition for such a mass. / A piece of music composed to honor a dead person. / (obsolete) rest; peace

ectodomain

An early photographic process in which the image is made on an iron plate having a sensitized surface film. / A photograph produced by this means.