How many letters does the top answer for “a treatise on, or the science of, the preservation of health.” have?

The most common answer is hygiology (9 letters).

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Crossword clue: a treatise on, or the science of, the preservation of health.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

hygiology 9 letters web-def

A treatise on, or the science of, the preservation of health. [R.]

Pattern

Data: SCOWL, igerman98, RLA-ES, Grammalecte, br.ispell · frequency: OpenSubtitles (see Data & licenses)