Is that a spice or something?

I see no reference to such a word except in eco-habitats, which I cannot figure out why I would build.

Telluric (from the Latin tellus, "earth") may refer to several things related to the Earth:

• Telluric planet, see terrestrial planet, an Earth-like planet primarily composed of silicate rocks

Soo earthlike planets basically any type of planet except gas giants. 

I wish they'd use "terrestrial", "rocky", or even just "non-gas" instead. Took me a couple moments to figure out what Telluric meant.

Mmmph! Just read EE Doc Smith' novels. Sure Amp are not first to use this nomenclature. The great space opera master was doing this before 1940.