adjective.
Having the power of perceiving, especially perceiving keenly and readily.
noun.
One that perceives.
The Century Dictionary and Cyclopedia
Perceiving; having the faculty of perception.
noun.
One who or that which perceives, or has the faculty of perception.
noun.
Specifically, one to whom the unexpressed thoughts of another (called the agent) are sought to be transferred in conducting telepathic experiments.
the GNU version of the Collaborative International Dictionary of English
adjective.
Having the faculty of perception; perceiving.