The word "calyceal" is an adjective that refers to something related to the calyx, which is the hollow structure at the base of a flower that supports the petals. Some synonyms for "calyceal" include "calicular" or "calycine," which both relate to the calyx. Other synonyms that could be used in place of "calyceal" might depend on the specific context or meaning in which it is being used. For example, if the intended meaning relates to the kidney, some possible synonyms could include "renal" or "nephritic," while if the intended meaning relates to the shape of something, "cup-shaped" or "flared" might be used instead.