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：brachi-, brachio-

【来源及含义】Greek: arm [especially the upper arm from the shoulder to the elbow]

【同源单词】abrachia, abrachia, abrachiocephalia, abrachiocephalus, acephalobrachia, antebrachial

词根词缀：cephalo-, cephal-; -cephalic, -cephalism, -cephalous, -cephalus; -cephaly

【来源及含义】Greek: head

【相关描述】Sometimes these "head" elements are also written as: kephalo-, kephal-, etc.

【同源单词】abrachiocephalia, abrachiocephalus, acanthocephalid, acepalothoracia, acephalia, acephaline