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：dexter-, dextra-, dextro-

【来源及含义】Latin: right, right hand, to the right; therefore, "skillful, fortunate"

【同源单词】ambidexter, ambidexterity, ambidextrous, ambisinistrodextrous, ambo dexter, amylodextrin

词根词缀：spiro-, spir-, spiri-

【来源及含义】Greek, speira > Latin, spira: coil, coiled; twisted, turning

【相关描述】The Greek speira refers to anything which is wound or wrapped around something. In the plural, speirai, it includes the twisted folds or coils of a serpent or of a net; therefore, it refers to anything which is coiled, wreathed, or twisted; such as, a coil of a snake.

Careful, there is another spiro- which means "breath of life; breathing, breath".

【相关词根词缀】There are other "coil" words at this helico- unit.

【同源单词】conchospiral, spiradenitis, spiradenoma, spiral, spiral, spiral