The term is used in planetary nomenclature: it is a part of international proper names of such features.
[1] Like the other terms of planetary nomenclature, this word describes only external view of the features, but not their origin or geological structure.
Names of bigger (especially domical) uplands usually contain the term Tholus ("dome"), and the names of still bigger mountains – the term Mons ("mountain").
Peculiar round mountains, which are found on Venus, get names with the term Farrum.
[2] The term Collis was introduced into planetary nomenclature in 1982, on XVIIIth General Assembly of International Astronomical Union.