Final answer:
The term 'prosoma' is associated with both the feeding and locomotion aspects of chelicerates and refers to the part of the body ahead of the mouth where the feeding appendages, chelicerae, are located.
Step-by-step explanation:
The term associated with the feeding and locomotion of chelicerates that refers to the part ahead of the mouth is prosoma. Chelicerates are members of the phylum Arthropoda, and their bodies are divided into two tagmata: prosoma and opisthosoma. The first pair of appendages, the chelicerae, are located on the prosoma and are used for feeding.
These appendages are often modified, such as in spiders where they terminate in fangs that inject venom into prey. The prosoma may also support pedipalps, which are appendages used for sensing the environment and manipulating food, and in some cases, ovigers used for grooming or carrying eggs in sea spiders.