a graphical record of readings produced by a tachograph
tachogram in American English
(ˈtækəˌɡræm)
noun
the record produced by the action of a tachometer
Also: tachograph
Word origin
[tacho- + -gram1]-gram is a combining form occurring in loanwords from Greek, where it meant “somethingwritten,” “drawing” (epigram; diagram). On this model, -gram is used in the formation of compound words (oscillogram)