noun
1. : basic raw material
requires … actual source materials in original languages on cultures, customs, economy — D.H.Clift
ship nuclear source materials to allied nations — Time
2. : parent material
noun
1. : basic raw material
requires … actual source materials in original languages on cultures, customs, economy — D.H.Clift
ship nuclear source materials to allied nations — Time
2. : parent material
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012