(databases) Initialism of entity-relationship diagram. / (cycling) Initialism of effective rim diameter.

(dialect, rare) Alternative form of earth

(zoology) The common European shrew (Sorex vulgaris); the shrewmouse or erd shrew.

plural of ERD

The common shrew (Sorex araneus).

plural of erd shrew

Alternative form of Erdős number

(mathematics) A number describing the degree of collaboration between a mathematician and Paul Erdős, defined such that a mathematician who has written a paper with Erdős has an Erdős number of 1, a mathematician who has written a paper with somebody having an Erdős number of 1 has an Erdős number of two, and so on.

Alternative form of aardvark

(medicine) polyostotic sclerosing histiocytosis, a rare disease characterized by the abnormal multiplication of histiocytes.