White-ribbed is a term used to describe something that has distinct white ridges or channels running along its length or surface. Synonyms for this particular term might include phrases like "ridged-white," "lineated-white," or "streaked-white." Other possible synonyms might incorporate descriptive adjectives that convey a similar visual appearance, such as "grooved," "corrugated," or "furrowed." Additionally, synonyms could be more general terms that describe the same general characteristic, such as "ridged," "striped," or "groovy." Whatever the particular synonym, each one helps to create a more detailed and specific description of the object or material in question.