The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
Appendix I
Indo-European Roots
ENTRY:
an-
DEFINITION:
On. I. Extended form *ana.1a.on; acknowledge, alike, from Old English an,on,a, on, and prefixed on-;b.aloft, amiss, from Old Norse , in, on; c.anlage, anschluss, from Old High German ana-, on; d.onslaught, from Middle Dutch aen, on. a–d all from Germanic *ana,*an.2.ana2, ana-, from Greek ana, on, up, at the rate of. II. Variant form *no.naprapathy, from Old Church Slavonic na, in, on, to, from Slavic *na. (Pokorny 4. an 39.)
, in, on; c. anlage, anschluss, from Old High German ana-, on; d. onslaught, from Middle Dutch aen, on. a–d all from Germanic *ana, *an
. 2. ana2, ana-, from Greek ana, on, up, at the rate of. 
