The adjective splanchnic isn't very common, though it's used sometimes in medical terminology, as in the splanchnic nerve, which connects to the digestive tract. When you see splanchnic, you know it's referring to a person's innards or organs. The original meaning of splanchnic is "pertaining to the viscera," from a Greek root, splankhnon, and its plural form, splankhna, "the entrails or innards."