词根词缀：feto-, fet-, feti-, foeto-, foet-

【来源及含义】Latin: an unborn offspring, fetus

【相关词根词缀】 Related "birth, born, childbirth, offspring" words: abort-; lochio-; nasc-, nat-; proli-; toco-, toko-.

【同源单词】afetal, alcohol fetopathy, effete, fawn, fetal viability, fetal

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