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Definition

noun

A fracture that is not visible in an x-ray imaging within 24 to 48 hours of trauma or injury, but will become visible in x-rays usually within three to four weeks at the time that the fracture site is healing or when a new bone is forming.

Supplement

Word origin: occult: from Latin occultus (ptp. of occulere to hide from view, cover up); fracture: from Latin frāctūra, from frāctus, past participle of frangere, to break.