The word "calc-" is a prefix that refers to the concept of "calcium" and is commonly used in scientific and medical fields. The primary synonym for calc- is "calci-," which is used interchangeably with calc- in many contexts. Other potential synonyms for calc- include "calcio-," which is another variation of the prefix that emphasizes the calcium component, as well as "oste-," which is a prefix that indicates the involvement of bone tissue. These synonyms can be helpful for understanding complex scientific terms and medical diagnoses that involve the concept of calcium or bone health.