XY recorder 
(ĕkswī)
(ĕkswī)n.
An output device that sketches the relationship between two variables onto a grid of plane rectangular coordinates.
- activation
- activation analysis
- activator
- active
- active galactic nucleus
- active galaxy
- active immunity
- actively
- active-matrix
- activeness
- active recreation
- active site
- active transport
- activewear
- activin
- activism
- activist
- activistic
- activity
- act of God
- actomyosin
- actor
- act out
- actress
- Acts of the Apostles