Webster's English Dictionary

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hemoglobin

he.mo.glo.bin \'he--m*-.glo--b*n, 'hem-*-, .he--m*-', .hem-*-'\ 
   \.he--m*-glo--'bin-ik, .hem-*-\ \-'glo--b*-n*s\ n [ISV, short for earlier 
   hematoglobulin] 1a: an iron-containing protein respiratory pigment 
   occurring in the red blo od cells of vertebrates 1b: a dark purplish 
   crystallizable form of this pigment found chiefly in th e venous blood of 
   vertebrates that is a conjugated protein composed of heme and globin 2: any 
   of numerous iron-containing respiratory pigments of invertebrates an d some 
   plants (as yeasts) - he.mo.glo.bin.ic aj