词根：-equ-

【词根含义】：均,等

【词根来源】：来源于拉丁语形容词aequalis, aequale, aequalior(均,等)和aequus, aequa(相等的)。 

【同源单词】：adequacy, adequate, equal, equality, equally

前缀：ad-

【词根含义】：来,临近;朝,向,趋向;加强意义

【词根来源】：来源于拉丁语前缀ad-。

【同源单词】：adapt, adaptable, adaptation, adaptive, addict

词根词缀：ad-

【来源及含义】Latin: prefix; to, toward, a direction toward, addition to, near, at; and changes to: ac-, af-, ag-, al-, an-, ap-, aq-, ar-, as-, at- when ad- is combined with certain words that begin with the letters c, f, g, l, n, p, q, r, s, and t

【相关描述】The form ad- appears in this form before a vowel and before the consonants d, h, j, m, and v. It is simplified to a- before sc, sp and st.

Before c, f, g, l, n, p, q, r, s, and t; ad- is changed to ac-, af-, ag-, al-, an-, ap-, aq-, ar-, as-, and at-.

In other words, the d of ad usually changes into the same letter as the first letter of the following root or word when it is a consonant: ad-fix becomes affix, and ad-sign becomes assign; therefore, making a double consonant.

Another example includes: attract as with ad-tract (drawn towards); so it has a double t. On the other hand when ad- precedes a vowel, as with adapt, it is simply ad-apt, with one d. For the same reason, there is only one d in adore and adumbrate, because ad- has combined with orare and umbra each of which starts with a vowel.

So, remember: since these Latin words begin with vowels and not consonants, the d of ad does not double as shown in the previous examples.

【同源单词】a capite ad calcem, Ab ovo usque ad mala, Ab uno ad omnes, Abiit ad majores, abjure, accede

词根词缀：equ-, equi-

【来源及含义】Latin: same, similar, even, uniform, identical; fair

【相关描述】Don't confuse this unit with another equ- unit meaning horse.

【相关词根词缀】 Inter-related cross references, directly or indirectly, involving word units dealing with "equal, identical, same, similar": auto-; emul-; homeo-; homo-; iso-; pari-; peer; rhomb-; syn-; tauto-.

【同源单词】adequacy, adequate, coequal, coequality, coequalize, coequally