An Etymological Dictionary of Astronomy and Astrophysics

Not typical, usual, or regular; not normal; deviant. → anomalous, → anomaly.

Etymology (EN): M.L. anormalis, blend of L.L. abnormis “deviating from a rule,” from ab- “off, away from” + L. norma “rule.”

Etymology (PE): Bihanjâr, from Pers. bi- “without” +
Pers. hanjâr “rule, habit, law, staright road.”