Terrassid

Terrassid is a term that appears in speculative fiction and hobbyist discussions to designate a group or class of beings associated with terrestrial environments or terraformed worlds. There is no single, canonical definition, and the meaning varies by author or game setting.

Etymology and form: The name seems to derive from terra, the Latin word for Earth, combined with a suffix common in taxonomy and science fiction for names of organisms or entities, such as -oid, -id, or -sid. Because it is used by different authors, its intended connotation can range from Earth-derived humanoids to lifeforms adapted to terraformed planets.

Usage in fiction and games: In some narratives, Terrassids are humanoid aliens with a cultural emphasis on soil, rock, and geology, or on terraforming processes themselves. In others, the term denotes a class of autonomous constructs or symbiotic lifeforms tied to soil ecosystems. The specifics—appearance, society, technology—are not standardized and are defined by the creator.

Real-world status: Terrassid is not recognized as a taxonomic group or scientific term. It exists primarily as a fictional or speculative concept used within fan communities, role-playing games, and informal worldbuilding.

See also: extraterrestrial life, terraforming, xenobiology.