adumbration; shadow or outline

Relating to the umbraviruses

Having or relating to an umbraculum.

An oral medication for the treatment of marginal zone lymphoma and follicular lymphoma.

divination using shadows

(mathematics) A mysterious connection between Niemeier lattices and Ramanujan's mock theta functions; a generalization of the Mathieu moonshine phenomenon connecting representations of the Mathieu group M24 with K3 surfaces.