词根词缀：procto-, proct-

【来源及含义】Greek: anus, rectum

【同源单词】ankyloproctia, aproctia, colectomy, coloproctectomy, coloproctostomy, Entoprocta

词根词缀：proto-, prot-

【来源及含义】Greek: first; foremost, front, earliest form of, original, primitive; chief, principal; usually used as a prefix

【同源单词】apolipoprotein, cryoprotein, fetoprotein, glycoprotein, hyperlipoproteinemia, hypolipoproteinemia