Rubber Seal
This page is the CodyCross answer for the clue below from Mesopotamia, Group 972, Puzzle 5 (Astronomical Diaries).
Question is: Rubber Seal
and the answer is: GASKET
Word Meaning:
GASKET — (sailing) A length of rope or canvas band used for reefing a sail, or holding a stowed sail in place.
Definitions from Wiktionary.