词根：-tom-
【词根含义】：切,割
前缀：a-
【词根含义】：在,到;来,临近;离开;否定;副词前缀;加强意义
【词根来源】：来源于古英语和中古英语a-, an, on。
【同源单词】：aboard, abroad, acentric, across, ago
词根词缀：a-, an-
【来源及含义】Greek: prefix; no, absence of, without, lack of; not
【相关描述】These prefixes are normally used with elements of Greek origin, a- is used before consonants and an- is used before vowels.
It affects the meanings of hundreds of words.
There are too many words that use these prefix elements to list all of them on this site; however, there are significant examples listed in this and the other units where they exist.
【同源单词】abacterial, abaptism, abarognosis, abasia, abiocoen, abiogenesis
词根词缀：tomo-,-tom, -toma, -tomic, -tomize, -tome, -tomical, -tomically, -tomist, -tomous, -tomy; -otomy
【来源及含义】Greek: cut, incision; section; more often used as a suffix
【相关词根词缀】 Related cutting-word units: cast-; castrat-; -cise, -cide; -ectomy; mutil-; put-; sec-, seg-; temno-; trunc-.
【同源单词】anatomy, atom, cephalotomy, cirsotomy, colostomy, computerized tomography