trace metal
metals normally present in small but measurable amounts in animal and plant cells and tissues and that are a necessary part of nutrition and physiology
en-GB/ˈtɹeɪs ˈmɛtəl/
en-US/ˈtɹeɪs ˈmɛtəl/
metals normally present in small but measurable amounts in animal and plant cells and tissues and that are a necessary part of nutrition and physiology