Available in PolyNome v2.4.9 and above

Tap the tempo display to bring up the Quick Tempo Entry page.

You'll see a label under the number display showing the classical tempo term for the current tempo.

Tap the name to see a list of all tempo names, or swipe left/right to step between them.

A tempo from the middle of the defined range will be set when you select a name.

Reference

The tempo ranges were taken from WikiPedia and adjusted so they don't overlap.

Here's the complete list of labels followed by their tempo range in PolyNome, followed by the description from WikiPedia

Larghissimo: