1697 Lhwyd in Phil. Trans. XXVII. 467All black, or atrorubent. 
1881 Syd. Soc. Lex. ,Atrosanguineous. 
atro-
combining form 
Etymology: Latin atr-, ater black + English -o- 
 : black and 
< atrocastaneous >
< atrocastaneous >
| 词汇 | atro- | 
| 词根词缀 | OED Webster 
 
 atro- < atrocastaneous > | 
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