Category: Definitions : The study of light and its relation to sight is called ________.?

Questions

What word occurs 46,227 times in the Bible?

What word was coined to describe a male "bimbo"?

What word's first two letters mean a man, first three letters mean a woman, & first four letters mean a great man?

What worms will eat themselves if they can't find any food?

What would a bushwalker most likely use to boil his water in?