The term SUFFIX DENOTING RESEMBLANCE can be represented by two 3-letter solutions: OID and ISH. OID is derived from the Greek word 'eidos' meaning 'form, shape, or appearance'. It is commonly used in medical terminology to denote a resemblance to a certain condition or disease. ISH is derived from the Old English word 'isc' meaning 'like, similar, or resembling'. It is often used to describe something that is not quite the same as something else, but has some similarities.