Definition of かいろ
- (n) pocket heater; hand warmer; heater pack
彼はカイロで体を暖めた。
He warmed himself with a pocket heater.
- (n-t) sea route
陸路を運ぶのは大変ですが、海路で運ぶのは簡単です。
It's very difficult to transport them overland, but simple to do so by sea.