There are several synonyms that can be used in place of the word "riblike," which refers to something that resembles a rib or is shaped like a rib. Some of these synonyms include ribbed, striated, grooved, furrowed, and ridged. "Ribbed" is a commonly used synonym and describes something that has raised ridges or lines running down its surface, much like the bones in a ribcage. "Striated" and "grooved" are also good substitutes, as they suggest the presence of parallel lines or grooves like those found on a rib. "Furrowed" and "ridged" both imply a deep indentation or ridge, and can be used to describe objects or surfaces that resemble the shape of a rib.