词根词缀:echo-, ech-
【来源及含义】Greek: sound, noise; especially a returned sound; repetition, imitation
【同源单词】anecho, anechoic, catecheses, catechesis, catechetical, catechism
词根词缀:-ic
【来源及含义】Greek: a suffix; pertaining to; of the nature of, like; in chemistry, it denotes a higher valence of the element than is expressed by -ous
【同源单词】abdominocystic, abdominopelvic, abdominoscopy, abdominothoracic, abiogenetic, abiogenic