adobe (n.)

1739, American English, from Spanish adobe "unburnt brick dried in the sun," which is said by 19c. Dutch Arabist Reinhart Dozy to be from oral form of Arabic al-tob "the brick," from Coptic tube "brick," a word found in hieroglyphics. Other sources point to a Spanish adobar "daub, plaster," from the source of English daub (v.).