Question

prefix 【PREFIX】"Under" in underline, "dis-" in disappear, and "pre-" in prepaid are prefixes.underline 中的"under"，disappear 中的"dis"和 prepaid 中的"pre"都是词首。【重点词汇】prefix n. 前缀词缀 反: suffix

Accepted Answer

['priːfɪks] 
prefixan affix that is added in front of the word
A prefix is affix that's added in front of a word and often changes the meaning of it. Common prefixes include re-, un-, and mis-.
Lots of words have a prefix, and it's sometimes easier to figure out the meaning of those words if you know the meaning of the prefix. For example, the super- means "above" or "over"; hypo- and infra- mean "under." Prefix itself has a prefix: pre-, which means "before." In fact, the Latin root of prefix is praefixus, meaning "fixed in front." (Note our word's opposite here, suffix, which describes what is fixed at the back of a word.)
All forms of 'prefix' will appear on average once every 1586 pages.prefixprefixation

Front	prefix
Pron	['priːfɪks]
Back	【PREFIX】 "Under" in underline, "dis-" in disappear, and "pre-" in prepaid are prefixes. underline 中的"under"，disappear 中的"dis"和 prepaid 中的"pre"都是词首。【重点词汇】 prefix n. 前缀词缀反: suffix
Vocab	prefixan affix that is added in front of the word A prefix is affix that's added in front of a word and often changes the meaning of it. Common prefixes include re-, un-, and mis-. Lots of words have a prefix, and it's sometimes easier to figure out the meaning of those words if you know the meaning of the prefix. For example, the super- means "above" or "over"; hypo- and infra- mean "under." Prefix itself has a prefix: pre-, which means "before." In fact, the Latin root of prefix is praefixus, meaning "fixed in front." (Note our word's opposite here, suffix, which describes what is fixed at the back of a word.) All forms of 'prefix' will appear on average once every 1586 pages. prefix prefixation

Prefix Meaning Prepaid Affix Added Front Word Means