adobe: [18] Adobe is of Egyptian origin, from the time of the pharaohs. It comes from Coptic tōbe ‘brick’ (the form t.b appears in hieroglyphs). This was borrowed into Arabic, where the addition of the definite article al produced attob ‘the brick’. From Arabic it passed into Spanish (the corridor through which so many Arabic words reached other European languages), and its use by the Spanish-speaking population of North America (for a sun-dried brick) led to its adoption into English in the mid 18th century.
adobe (n.)
1739, American English, from Spanish adobe, from oral form of Arabic al-tob "the brick," from Coptic tube "brick," a word found in hieroglyphics.