Delmotte is a small lunar crater that lies just to the east of the much larger crater Cleomedes, and to the north of the Mare Crisium, in the northeastern part. Delmotte appears foreshortened when viewed from the Earth, although not sufficiently to obscure the interior details. The crater rim is roughly circular, with a sharp-edged, slightly angular rim, and a slender inner wall. The northwestern part of the rim has a linear cleft that runs toward the northeast. (wikipedia entry)
A crater is a circular depression likely created by an impact event. On the Moon they are named after deceased scientists, polar explorers, astronauts or cosmonauts.