A- or AD-

One of the words in today's Jumble was ADJOIN, which I had heard of before, but I always thought it was sort of a legal term. I thought the common term was ajoin, as they live in ajoining apartments, but ajoin is not an English word, at least according to Merriam-Webster. Then I thought of adjacent, which starts the same as adjoin, but the D is not pronounced, and when I check with the dictionary again, there is no evidence the D is pronounced in either adjoin of adjacent. I can't see it in their cryptic printed pronunciation guide, and I don't hear it in their spoken example. Just one way the online dictionary is an improvement over the printed one. Stupid English.