eidos

1 :  something that is seen or intuited: a in Platonism :  idea b in Aristotelianism (1) :  form essence (2) :  species c :  an appearance, conception, or form of intuition

2 :  the cognitive part of cultural structure made up of the criteria of credibility, the logic used in thinking and acting, and the basic ideas by which the members of a culture organize and interpret experience :  logical structure the eidos is visible wherever group behavior is characterized by intellectual efforts of a similar kind — S. F. Nadel —contrasted with ethos