"small, unbound treatise," late 14c., from Anglo-Latin panfletus, popular short form of "Pamphilus, seu de Amore" ("Pamphilus, or about Love"), a short 12c. Latin love poem popular and widely copied in Middle Ages; the name from Greek pamphilos "loved by all," from pan- "all" + philos "loving, dear" see -phile). Meaning "brief work dealing with questions of current interest" is late 16c.