en·gram noun alsoen·gramme\ˈenˌgram, ˈeŋˌg-\ (-s) Etymology: International Scientific Vocabulary en- (II) + -gram; originally formed as German engramm : a memory trace; specifically: a protoplasmic change in neural tissue hypothesized to account for the persistence of memory • en·gram·mic\(ˈ) ̷ ̷|gramik\adjective