\Box"en\ (b[o^]ks"'n), a.
Made of boxwood; pertaining to, or resembling, the box
({Buxus}). [R.]
The faded hue of sapless boxen leaves. --Dryden.
Computing Dictionary
Definition:
/bok'sn/ (By analogy with vaxen) A fanciful plural of box often encountered in the phrase "Unix boxen", used to describe commodity unix hardware. The connotation is that any two Unix boxen are interchangeable.
Webster's 1913 Dictionary