an iron-containing protein in muscle, similar to hemoglobin, that receives oxygen from the red blood cells and transports it to the mitochondria of muscle cells, where the oxygen is used in cellular respiration to produce energy
See myoglobin in American Heritage Dictionary 4
(mīˈə-glōˌbĭn)
noun
A single-chain, iron-containing protein found in muscle fibers, structurally similar to a single subunit of hemoglobin and having a higher affinity for oxygen than hemoglobin of the blood.