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

词根词缀：toxico-, toxic-, toxi-, tox-, toxin-, -toxically, -toxaemia, -toxemia, -toxaemic, -toxemic, -toxical, -toxy, -toxis, -toxicosis, -toxism, -toxia, -toxin, -toxicity

【来源及含义】Greek: poison

【相关词根词缀】 A cross reference of another word family that is related directly, or indirectly, with: "poison": veno-; viru-.

【同源单词】abstemious, acarotoxic, acetyldigitoxin, actinotoxemia, actinotoxin, adrenotoxin

词根词缀：xylo-, xyl-

【来源及含义】Greek: wood; the first element of various scientific and technical words that refer to wood

【相关词根词缀】 Related "wood" word units: hylo-; ligni-.

【同源单词】aeroxyl, chiroxylography, chromoxylograph, chromoxylography, epixylous, geoxyl