масса
massa [ae, f];
электрон
elctronium [ii, n];
пожалеть
commiserescere [miseret, miseruit]
reddere, o, didi, ditum; redonare [1] ; referre, o, tuli, latum; reponere, o, posui, positum; restituere, o, ui, utum; reducere, o, xi, ctum; reciprocare [1] ; recuperare [1] ; repetere, o, ivi, itum;