Sentence:  The pulmonary artery , in addition to supplying the <WSD>distal</WSD> portion of the respiratory bronchiole , the alveolar duct , and the alveoli , continues on and directly supplies the thin pleura ( fig. 8 ) . 
Meaning of the word marked with <WSD> tags:  situated farthest from point of attachment or origin, as of a limb or bone