Correct spelling for the English word "muclgen" is [mˈʌkld͡ʒən], [mˈʌkldʒən], [m_ˈʌ_k_l_dʒ_ə_n] (IPA phonetic alphabet).
A substance formed in the secreting cells of the mucous membranes, convertible into mucin.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.