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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

thing go
a separate and self-contained entity

unit, building block go
a single undivided natural thing occurring in the composition of something else

molecule go
(physics and chemistry) the simplest structural unit of an element or compound

macromolecule, supermolecule go
any very large complex molecule

protein go
any of a large group of nitrogenous organic compounds that are essential constituents of living cells

conjugated protein, compound protein go
a protein complex combining amino acids with other substances

hemoprotein, haemoprotein
a conjugated protein linked to a compound of iron and porphyrin

noun.substance

3 Subcategories

hemoglobin, haemoglobin, Hb go
a hemoprotein composed of globin and heme that gives red blood cells their characteristic color
myoglobin go
a hemoprotein that receives oxygen from hemoglobin and stores it in the tissues until needed
cytochrome go
(biochemistry) a class of hemoprotein whose principal biological function is electron transfer (especially in cellular respiration)