plac-
combining form 
or placo-
Etymology: Greek plak-, plako- flat surface, tablet, from plak-, plax — more at please 
 : tablet : flat plate 
< placodont >
< placoderm >
or placo-
< placodont >
< placoderm >
| 词汇 | plac- | 
| 词根词缀 | Webster plac- or placo- < placodont > < placoderm > | 
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