n.
Pronunciation: ˌ vi-zh ə -w ə -l ə - ' z ā -sh ə n, ˌ vi-zh ə -l ə -, ˌ vizh-w ə -l ə -
Function: noun
Date: 1883
1 : formation of mental visual images
2 : the act or process of interpreting in visual terms or of putting into visible form
3 : the process of making an internal organ or part visible by the introduction (as by swallowing) of a radiopaque substance followed by radiography