RECTO is a 5 letter word that starts with R.

1. \Rec"to-\ (r?k"t?*).
   A combining form indicating connection with, or relation to,
   the rectum; as, recto-vesical.
   
   

2. \Rec"to\, n. [Abbrev. fr. LL. breve de recto. See
   {Right}.] (Law)
   A writ of right.
   
   

3. \Rec"to\, n. [Cf. F. recto.] (Print.)
   The right-hand page; -- opposed to verso.