The term 'shaped like a crescent or half-moon' can be summarized by the word semilunar, which has nine letters. Semilunar is an adjective that describes something that is shaped like a crescent or half-moon. This shape is often associated with the moon, as it is the shape of the moon during its waxing and waning phases. It is also used to describe certain objects, such as the shape of some leaves or the horns of certain animals.