D defs.my
Entry 1 sense Webster, 1913

Collagen

/käl'-əg-ən/ · Col·la·gen · IPA /ˈkɒləd͡ʒən/
01 n. The chemical basis of ordinary connective tissue, as of tendons or sinews and of bone. On being boiled in water it becomes gelatin or glue.
  1. 1.
    The chemical basis of ordinary connective tissue, as of tendons or sinews and of bone. On being boiled in water it becomes gelatin or glue.(Physiol. Chem.)