noun: An introduction, preface, or preamble.
From Old French proeme, from Latin prooemium, from Greek prooimion, from pro- (before) + oime (song). Earliest documented use: 1410.
“However, if one carries on reading beyond the proem and carefully examines the main body …”
Eleni Kechagia; Plutarch Against Colotes; Oxford University Press; 2011.