Sentence:  It is characterized by the presence of incompletely developed secondary lobules ; <WSD>well</WSD> defined , but haphazardly arranged , interlobular septa and a thick , remarkably vascular pleura ( fig. 9 ) . 
Meaning of the word marked with <WSD> tags:  (often used as a combining form) in a good or proper or satisfactory manner or to a high standard (`good' is a nonstandard dialectal variant for `well')