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：adamant-

【来源及含义】Latin: hard as steel, iron

【同源单词】adamantine

词根词缀：-ade

【来源及含义】Latin: suffix; forming nouns and verbs; an action done; the product of or a result of some kind of material or a process of doing something

【同源单词】accolade, aquacade, arcade, autocade, brigade, cannonade

词根词缀：adelpho-, adelph-, -adelphia, -adelphous

【来源及含义】Greek: brother

【同源单词】Adelphi, adelphic, adelphogamy, adelpholite, adelphoparasite, adelphophagy

词根词缀：adeno-, aden-, adeni-

【来源及含义】Greek: gland or glands, glandular [from “acorn”]

【同源单词】adenalgia, adendric, adenectomy, adenectopia, adenia, adenic

词根词缀：adipo-, adip-, adipos-

【来源及含义】Latin: fat, fatty; lard; of or pertaining to fat; fleshy

【相关词根词缀】Other related units of fat words: lard; lipo-; obeso-; oleo-; omento-; pimelo-; pio-; sebo-; steato-.

【同源单词】adipal, adipate, adipectomy, adipescent, adipic, adipis

词根词缀：adreno-, adren-, -adrenal-

【来源及含义】Latin: a gland or the glands near the kidneys: ad-, "near" plus ren[es], "kidneys"

【相关描述】The name applies to the adrenal glands because of their proximity to the kidneys.

【同源单词】adrenal, adrenalectomize, adrenalectomy, adrenaline, adrenalism, adrenalitis

词根词缀：aego-, aeg-; ego-, eg-

【来源及含义】Greek > Latin: goat

【相关词根词缀】 Related goat-word units: capri-; hirco-; tragico-.

【同源单词】aegagrus, Aegeus, aegicrania, aegilops, Aegina, aegis

词根词缀：aello-

【来源及含义】Greek: stormy wind, whirlwind; from Greek mythology, Aëllo, a harpy; whose name literally means, "Stormswift"

【相关词根词缀】 Cross references of word groups that are related, directly or indirectly, to: "air, wind": aeolo-; aero-; anemo-; atmo-; austro-; flat-, flatu-; phys-; pneo-, -pnea; pneumato-; turb-; vent-; zephyro-.

【同源单词】Aello, aelophile, aelophilous, aelophily, aeolation, aeolian deposit

词根词缀：aeluro-, aelur-, ailuro-, ailouro-, ailur-, eluro-

【来源及含义】Greek: cat, cats

【相关词根词缀】Cross references of word families that are related directly, or indirectly, to: "cat": cat; feli-, felin-; galeo-; gato-.

【同源单词】Aeluroid, aeluromancy, aeluromania, aelurophile, aelurophilic, aelurophobe