Dear Don,
I don´t know if this note I´m adding here is pertinent in our Nabokov-L debate.  And yet, after I had wondered about the word "Rast" and got answers about "pederasty" where it was confused with "pedophily" I thought it might be profitable to mail. I got it from an online dictionary ( Douglas Harper as I understood it to be signed )
The "rast" in pederast has a beautiful Greek origin: erasthai ( love ). 
 
Online dictionary clarification:
pederasty:  "sodomy with a boy," 1609, from Mod.L. pćderastia, from Gk. paiderastia "love of boys," from paiderastes "pederast," from pais (gen. paidos) "child, boy" + erastes "lover," from erasthai "to love." Pederast is 1730s, from Fr. pédéraste, from Gk. paiderastes.
pedagogy: 1387, "schoolmaster, teacher," from O.Fr. pedagogue "teacher of children," from L. paedagogus "slave who escorted children to school and generally supervised them," later "a teacher," from Gk. paidagogos, from pais (gen. paidos) "child" + agogos "leader," from agein "to lead". Hostile implications in the word are at least from the time of Pepys. Pedagogy is 1583 from M.Fr. pédagogie, from Gk. paidagogia "education, attendance on children," from paidagogos "teacher."
pedophilia: 1905, from Gk. pais (gen. paidos) "child" + philos "loving." First attested in Havelock Ellis. Derivative noun pedophile is first recorded 1951.