Testudinal is an adjective that describes something resembling or relating to a tortoise or turtle. Some synonyms for testudinal are chelonian, chelonian-like, and tortoise-like. Another synonym that can be used is turtle-like, which can be a bit more general since it can describe both tortoises and turtles. Other words that can be used as synonyms for testudinal are reptilian and reticulated, which both refer to characteristics associated with turtles and tortoises. Ultimately, these synonyms can be helpful in describing the physical appearance or behaviors of animals, structures, or objects that resemble turtles or tortoises.