Nice correspondence for those who know other Romance languages: non-initial "r" in Romanian often corresponds to "l" in the other languages. Romanian 'miere' = Italian 'miele', Spanish 'miel'. Romanian 'sare' = Italian 'sale', Spanish 'sal'. Romanian 'măr' = Italian 'mela'. etc.
Linguists even have a name for it! :)
Also there's the modification of "d" into "z".
Latin "die", Spanish "dia" -> "zi" = day in Romanian
Latin "decem", Italian "dieci" -> "zece" = ten
Latin "dicere", Italian "dire" -> "zice" = to say
Great observation! However, you know how it goes between languages (even dialects). To every rule, there has to be one or two exceptions which vary every which way. For example, you have abstract ideas that match the pattern: Durere = douleur, Fericire = félicité, etc. On the other hand, you have: Putere = pouvoir, Reproducere = reproduction, Facere = fabrication, Construcție = construction, Băutură = boisson, Pară = poire, Cireașă = cerise (ciliegia in It!)... And then you have the really weird ones like: conducere = leadership (I love French, don't you?-).
Good nuance! It all comes down to the original phoneme. The Proto-Romance 'l' tended to become 'r' in Romanian and stay 'l' elsewhere, while the Proto-Romance 'r' (as well as the 'r's in reborrowed Latinate terms like "reproducere") remained 'r' in all the daughter languages. There's also positional factors, like initial 'l' stayed 'l' in Romanian (e.g. lingua --> limbă)
Very interesting observation/correlation! Even more so, since copil comes from Slavic/albanian roots while copie comes from French/Latin!
BTW, a minor correction (notice difference between 2 and 3), which supports your observation:
- copil = a child
- copii = children, copies,
- copiii = the children
- copiile = the copies
- copie = copy
I would like to add this link to show not only the etymology but also other Romance cognates:
From Latin mel, mellem, possibly through Vulgar Latin *melem (a root). Ultimately from Proto-Indo-European *mélid. Miel (“lamb”) is a false friend to other Romance cognates of miere, which include Catalan mel, French miel, Italian miele, Portuguese mel, Spanish miel, Aromanian njare, Megleno-Romanian m'ari, Istro-Romanian mľåre.
miere f (uncountable)
Declension chart (singular only)
Does this necessarily derive from a Latin root? I found that "meli-" is a combining form (meaning "honey") from Greek ! Who knows? In order to edit this comment, and in researching the etymology of "miel", my source seems to suggest that it derives (somehow) from "agnellus", the Latin word, but I myself cannot see how, really. (This source reveals that"miel" is also slang for a certain male body part.)