That which comes from one's imagination.
A fantastical design.
The drug gamma-hydroxybutyric acid.
The literary genre generally dealing with themes of magic and the supernatural, imaginary worlds and creatures, etc.
To imagine; to conceive mentally.
To fantasize (about).
The tendency to focus one's attention on one specific idea or viewpoint, to the exclusion of everything else.
A restricted field of vision as the result of looking through some type of object or a medical condition.