| 释义 | grad·o·col membrane noun
 also grad·a·col membrane \ˈgradəˌkȯl-, -käl-\
 Etymology: German gradokol, from grado- (from International Scientific Vocabulary grade) + kollodium collodion
 : a collodion membrane prepared from a solution of collodion in alcohol and ether in such a way as to have a predetermined average pore diameter and used especially in ultrafiltration (as of a virus suspension)
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