incognitum means an American mammoth or mastodon, especially when presumed extant. Lexicurio rates it Sui generis — a strength score of 85 out of 100.
Why “incognitum” is a great word
INCOGNITUM — [Noun] A term for the colossal bones of an American mammoth or mastodon, presumed in the 18th century to belong to an unknown and possibly still-living creature. From Latin incognitum ("unknown thing"), neuter of incognitus ("unknown"). Coined in the 18th century by the anatomist William Hunter. Unlike "mammoth" (a specific, classified genus) or "mastodon" (another distinct proboscidean), "incognitum" is not a taxon but a phantom—a placeholder for the gap in knowledge itself. It was the curve of a tusk, too large for any living beast, emerging from a riverbank; the staggering weight of a single molar, ground flat by millennia, held in a naturalist's hand; the silhouette of a giant conjured from scattered vertebrae and sketched into the blank spaces of a new continent's map. A fossil word preserving the brief, profound tremor between finding a thing and understanding it.
noun
- An American mammoth or mastodon, especially when presumed extant.“When, as president, he dispatched Meriwether Lewis and William Clark to the Northwest, Jefferson hoped that they would come upon live incognita roaming its forests.”