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：dromo-, drom-, -drome, -dromic, -dromical, -dromous

【来源及含义】Greek: running, course; race, racecourse

【同源单词】adromia, aerodromic, aerogenerator, airdrome, amphidromous, anadromous