Glass Enclosed Room or Porch
This page is the CodyCross answer for the clue below from Treasure Island, Group 1030, Puzzle 4 (Maps and Charts).
Question is: Glass Enclosed Room or Porch
and the answer is: SOLARIUM
Word Meaning:
SOLARIUM — (chiefly US and Canada) A room, rooftop, balcony, or terrace, used for its abundant sunlight, especially when used as a medical treatment.
Definitions from Wiktionary.