misdiagnosed

The word is built upon the core verb 'diagnose,' which entered English in the 19th century from the Greek 'diagignōskein,' meaning "to distinguish" or "to discern" (from 'dia-,' "apart," and 'gignōskein,' "to know"). The Old English prefix 'mis-' (from Proto-Germanic missa-, meaning "wrongly") is attached to convey the sense of an erroneous or faulty act of identification. The final '-d' marks it as the regular past tense and past participle form. Thus, 'misdiagnosed' literally tells the story of an act of knowing something apart (diagnosing) that was performed incorrectly.

Structure: mis (bad/wrong) + diagnose (identify a disease) + d (past tense suffix) - mis: Old English, a prefix meaning "badly," "wrongly," or "ill." - diagnose: Greek via Latin and French, a verb meaning to identify the nature of an illness or problem. - d: English, a suffix indicating the past tense and past participle form of a regular verb.