fossorial adjective 1noun 1forms 3 adjective1 •Of, pertaining to, or adapted for digging or burrowing.The most specialized fossorial mammals (moles, marsupial mole) are subterranean, seeking food and shelter underground and rarely coming to the surface. — 2006 noun1 •Any digging animal (such as a mole) formsfossorials · more fossorial · most fossorial