ERYTHROCRUORIN

 ̷ ̷ˌ ̷ ̷ ̷ ̷ˈkrüərə̇, ru̇ə- noun

Etymology: erythr- + cruorin (old name for hemoglobin)

: any of various red respiratory pigments that occur in blood, cells, or body fluids of several invertebrate animals and that are or are related to hemoglobins