Chain
Chains
noun
くさり
鎖 (くさり) Chain, Chains
連鎖 (れんさ) Chain, Chaining, Connection
薬 (くすり) Medicine, Drug, Drugs
腐る (くさる) To Rot
臭い (くさい) Stinky, Stinking, Smelly
Seaweed on Chains 鎖 will Rot 腐る and become Stinky 臭い
Imagine the り as being ly. Sounds like Smelly. The chain is smelly.