n.
Pronunciation: ' h ī - ə -l ə n, - ˌ l ī n, in sense 2 -l ə n or - ˌ l ē n
Function: noun
Date: 1667
1 : something (as the clear atmosphere) that is transparent
2 or hy · a · lin \ -l ə n \ : any of several translucent nitrogenous substances related to chitin, found especially around cells, and readily stained by eosin