How many letters does the top answer for “inflammation of the brain and spinal cord and their meninges” have?

The most common answer is meningoencephalitis (19 letters).

Crossword clue: inflammation of the brain and spinal cord and their meninges

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

meningoencephalitis 19 letters wn-def

inflammation of the brain and spinal cord and their meninges

inflammation of the brain and spinal cord 80% similar → encephalomyelitis

inflammation of the spinal cord 60% similar → myelitis

of or relating to the brain and spinal cord 50% similar → cerebrospinal