礼す is read as らいす (raisu) and means to worship.
らいす
raisu
れい
key money
れいきん
れいじょう
acknowledgment
れいふく
formal dress
らいさん
praise
れいぶ
Ministry of Rites (Tang dynasty China)
れいまわり
making the rounds to express thanks
いやごと
words of gratitude
しつれいします
excuse me
まえをしつれいします
excuse me (when passing in front of someone)
れいぎ
manners
らいはい
worship (esp. Buddhist and Shinto)