1. mining

A block which has been disconnected from the primary blockchain and no longer has a path to the tip.

This can happen when the same block is discovered by multiple miners at the same time, leaving the rest of the network unsure which block to build on top of. Once the next block is found, the network consolidates around the now definitively longest chain, and the shorter block get abandoned (orphaned).

* All terms and definitions may update as the Cryptionary improves.