Crescentiform refers to something shaped like a crescent moon. There are several other synonyms for this word that can be used interchangeably. The first of these is horn-shaped, which also describes something that is curved like a horn. Another synonym is sickle-shaped, which is derived from the tool used for harvesting crops. Crescentic is another word that can be used to describe something that is shaped like a crescent. Additionally, falcate and lunate both refer to things that are shaped like a crescent moon. Overall, there are several different words that can be used to express the idea of something being crescent-shaped.