The word 'spotted' is built upon the root 'spot', which entered Middle English from a common Germanic source, likely related to concepts of a mark or blemish. The addition of the adjectival suffix '-ed', a productive Old English ending used to denote 'having the quality of', transforms the base noun into a descriptive term. Originally describing something physically marked with spots, its semantic field expanded metaphorically. The modern sense of 'having been seen' derives from the verb 'to spot', meaning to catch sight of, applying the same '-ed' suffix to indicate the state resulting from that action.

Structure: spot (mark) + ed (adjective suffix) - spot: From Middle English, of Germanic origin; related to Middle Dutch 'spotte'. Functions as the root noun/verb meaning a small mark or to see. - ed: From Old English '-ed', '-od', '-ad', a suffix forming adjectives from nouns or verbs, indicating possession of a quality.