For Humans in the mirror universe, please see Terran (mirror).

Terran was a word used to refer to anything attributed to Humans or the planet Earth, which in Latin is Terra. The Klingonese word for Human is "tera'ngan". (ENT: "Affliction"; Star Trek V: The Final Frontier)

Usage when referring to things attributed to Humans:

• "Terran" was used explicitly to refer to Humans...
  • ...in 2268, when a female Romulan Commander asked Spock if he called himself Terran or Vulcan. (TOS: "The Enterprise Incident")
  • ...in 2287, when Ambassador St. John Talbot was referred to as a Terran by both the Vulcan Sybok and the Klingon Vixis. (Star Trek V: The Final Frontier)
• The SS Mariposa used a Terran distress beacon created by the European Hegemony. (TNG: "Up The Long Ladder")
• Data referred to Terran conjugal rites. (Star Trek Nemesis)
• Shinzon saw a Romulan doctor who had experience in Terran illnesses. (Star Trek Nemesis)

Usage when referring to things attributed to Earth:

• The "Terran solar system" and "Terran system" were alternate names for the Sol system, which contained Earth. (Star Trek IV: The Voyage Home; TNG: "The Best of Both Worlds"; DS9: "Valiant")
• The term Terran leech was used to separate it from other leeches. (TNG: "Phantasms")