Some basic terms:
Thinker: Species of the protagonist. They are automata composed of a thoughtcrystal surrounded by a special slime and metallic bones. They also have robotic eyes and voiceboxes. Most of them have no mouth. They live either near the core of the world or near the edge.
Thoughtcrystal: heart of a Thinker, said to be their very soul. They get nourished and can even grow when a Thinker meditates, letting their thoughts flow free and without interference or even interpretation.
Spire: Roughly hewn stone towers where Thinkers of the Core live. They adapt to their occupant and have a measure of sentience.
Palace: Spire equivalents found at the edge of the world.
Cynothalassa: Proper noun that designates the ocean of dogs floating in the middle layers of the world. Name inspired by Panthalassa, the ocean that surrounded Pangea.
Psycholocation: Thinkers can use the energy of their crystal cores to send out waves that bounce off objects and create an image of their surroundings, even beyond immediate physical barriers.
Corship: Parvov's subcanine ship/walker. Made mostly from locally-sourced corgis.
World before the world: where the creators of the Thinkers lived.
World before the world before the world: Where the creators of the creators lived. Also called The Carving.
Psychosarc: Technical term to define the Thinker's slimy matrix. Flesh of the soul.
Some biological terms that are not made up but look like it:
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Quiridium: Limb of a tetrapod, composed by an Stylopod, Zeugopod, and Autopod. Your arms and legs. Also your dog's and a bird's and a whale's and even the little stumps some snakes have.
Stylopod: part of the limb composed by the humerus or femur.
Zeugopod: Part of the limb composed by two long bones, distal to the stylopod and proximal regarding the autopod. Section of the radius and ulna or the tibia and fibula.
Autopod: Distal end of a quiridium, composed of carpals or tarsals, metacarpals or metatarsals, and phalanxes. Characteristic presence of digits (May fuse in aquatic or flying forms).
Microfilaria: Dirofilaria (heartworm) larvae.
Coenosarc: Fleshy layer of a coral, connecting the polyps.
Coenostium: Calcareous skeleton secreted by the coenosarc.
Hermatypic: Reef-forming, generally referring to organisms.
Stromatolites: biogenic depositions of layers of calcium carbonate prompted by a microbial mat that hosts a community of bacteria and other organisms. Relatively common in the fossil registry. "Living" stromatolites can be found in the seas of the Bahamas, for example.
Schizochroal: Term related to a type of eyes present in some Phacopida (A group of Trilobites) consisting in tens of big lenses separated by a deep esclera between them.
Aristotle's lantern: A structure found in the mouth of regular sea urchins. It consists of an intricate arrangement of skeletal plates and associated muscles that act as five teeth/jaws for the creature to graze.