【教えて下さい】「left nasal」の意味

The nasal cavity washer comprises a water discharge port 1 which is made thin and small so that a specific part of a nasal cavity can easily be washed, and a body 2 with a fold 3 provided on both right and left sides from the bottom, whose front and back are made flat so that it can be easily pressed with fingers.
鼻腔の特定の部分が洗浄し易いように、細く小さい放水口１と、底から左右両側に折目３を入れ、指で押し易いように前後を平たくした本体２からなっている。

http://ejje.weblio.jp/sentence/content/left+nasal