mottle

The word 'mottle' emerged in the late 17th century, its formation echoing the visual effect it describes. It is believed to be a back-formation from the adjective 'motley', which referred to a cloth woven from different colored threads, creating a variegated appearance. The core idea likely stems from the Middle English word 'mot', meaning a speck or tiny particle, which itself has Proto-Germanic origins. Thus, the etymological logic flows from the concept of a small, distinct particle ('mot') to a fabric of mixed particles of color ('motley'), and finally to the verb describing the process of creating such a spotted, speckled pattern ('mottle').

The word 'mottle' is a simplex word, likely formed in English from the earlier, now obsolete, noun 'motley' (a fabric of mixed colors) combined with the frequentative verbal suffix '-le'. Its ultimate origin is uncertain but may be related to 'mot' (a speck or small particle), from Middle English.