How many letters does the top answer for “an inflammation of bone and bone marrow” have?

The most common answer is osteomyelitis (13 letters).

Crossword clue: an inflammation of bone and bone marrow

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

osteomyelitis 13 letters wn-def

an inflammation of bone and bone marrow

fibrosis of the bone marrow 50% similar → myelofibrosis

inflammation of a bone and its periosteum. 50% similar → osteoperiostitis

of or relating to bone marrow 50% similar → myeloid