The Collaborative International Dictionary
azonal
azonal \azonal\ adj. not divided into zones; -- opposite of zonal. azonal heating
Wiktionary
azonal
a. Of a soil, remaining immature and mainly composed of the parent material, as for example where sloping land causes fine-grained material to slide away.
WordNet
azonal
adj. not divided into zones; "azonal heating" [ant: zonal]