"Attiguous" is an unusual word that means "having a common boundary or touching." The word is spelled a-t-t-i-g-u-o-u-s, with the stress falling on the second syllable. The first "t" is pronounced /ˈæt/ as in "at," the "g" is pronounced /ɡ/ as in "go," and the "u" is pronounced /ju/ as in "you." This is followed by the /o/ vowel sound and ending with /əs/ as in "us." Despite its infrequent use, "attiguous" is a valuable word to know for describing objects or places that are physically connected.