what is chitin in biology
chitin. (Science: cell biology) a cross linked polymer of N acetyl D glucos amine that is the major structural component of arthropod exoskeleton s and fungal cell wall s. Widely distributed in plant s and fungi.hiton, a tunic, undergarment]. A structural polysaccharide of an amino sugar found in many fungi and in the exoskeleton s of all arthropods. chlorophyll ... ~ /KITE-in/ A structural polysaccharide that is the main component of the exoskeleton s of all arthropods and the cell wall s of fungi.