A Functional Reinterpretation of the Voynich Manuscript: A Late Medieval Medical–Pharmacological Compendium from Central Europe

The Voynich Manuscript has long been considered one of the most enigmatic documents of the late Middle Ages, frequently interpreted as a ciphered text, a hoax, or an esoteric work devoid of practical meaning. This study proposes a fundamentally different interpretation: the Voynich Manuscript is a coherent medical-pharmacological compendium, rooted in the Central European monastic tradition of the late medieval period, employing a compressed technical language that combines image, structure, and text. Through systematic comparison with contemporary manuscripts—most notably the Tractatus de Herbis (Sloane MS 4016), the Hortus Sanitatis, the Tacuinum Sanitatis, Hieronymus Brunschwig’s Liber de arte distillandi, and the medical-alchemical manuscript A.p.l. 584—this work demonstrates that the Voynich Manuscript follows established visual and operational conventions of medieval botany, chronobiological medicine, and pharmaceutical preparation. The study shows that the apparent botanical anomalies of the Voynich are consistent with functional distortion typical of medieval herbals, where images prioritize medicinal use over naturalistic representation. The so-called “balneological” section is reinterpreted as a graphical representation of pharmaceutical processes, including distillation, transfer of liquids, and staged preparation, closely paralleling documented laboratory practices of the fifteenth century. Furthermore, the manuscript’s circular diagrams are shown to align with medical calendrical systems rather than astrological speculation. Crucially, the analysis of A.p.l. 584 provides evidence for systems of implicit measurement and operational repetition without explicit numerical notation, offering a compelling explanation for the Voynich text’s structure and resisting cryptographic interpretations. The manuscript’s language is thus understood as technical compression rather than encryption. This reinterpretation situates the Voynich Manuscript within a real, functional intellectual tradition and removes the necessity for extraordinary explanations. The manuscript emerges not as an unsolved riddle, but as a specialized tool designed for trained users within a closed medical-pharmacological context.