I cannot understand your question. If your question concerns d of d’accord then a brief explanation is as follows:
D’ is an elision of the preposition de that happens before words that start with vowels or h muet.
- être d’accord; elle vient d’une famille riche, etc.
The so-called h muet is another story…Some useful links
Initially, my response concerned the final letter (d) of the word. Instead of completely erasing it, I reversed the order of my reply. May be you or someone else find useful the following.
Accorder, the verb, gives-nom déverbal or deverbative noun- the noun accord.
Accorder comes from basic latin accordare composed by ad+cor+cordis+are.
Other nouns that come from verbs include:
- écart from écarter
- retard from retarder
The consonant in the end of the noun usually is not pronounced. However, there are a few exceptions of the final consonant rule. The most classic one is cauchemar which means nightmare. The corresponding verb is cauchemarder. One other word of the same family is cauchemardesque. One sees that cauchemar does not keep the final d, despite its presence in other words of the same family.
Cauchemar was once written cauchemare where mare signifies phantom or ghost. Note the very presence of mare in the english counterpart nightmare.
It is shortened if the word starts with a vowel. Such as:
d’accord = of agreement
but if it doesn’t start with a vowel, then you use du for masculine or de for feminine. Such as:
Banque du Canada
femme de Aquitaine