See also: erd, and -erd English Noun ERD (countable and uncountable, plural ERDs) (databases) Initialism of entity-relationship diagram. (cycling) Initialism of effective rim diameter. Translations entity-relationship diagram Persian: نرام, نمودار رابطه-موجودیت Anagrams -red, DRE, Der, Der., EDR, RDE, RED, Red, der, redWikiwand - on Seamless Wikipedia browsing. On steroids.