¦nän sometimes ¦nən ˌ adjective
: causing little or no pollution
a freely available, nonpolluting , renewable source of energy—sunlight — Barry Commoner
¦nän sometimes ¦nən ˌ adjective
: causing little or no pollution
a freely available, nonpolluting , renewable source of energy—sunlight — Barry Commoner
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012