Noun or verb acting prenominally, Suru verb, Intransitive verb
plump; rotund; chubby
それから、毎日おじいさんと、おばあさんがこねこにミルクを飲ませましたら、こねこは、まもなく、かわいらしいまるまるとしたねこに、なりました。Every day grandfather and grandmother gave the kitten plenty of milk, and soon the kitten grew nice and plump. Adverb (fukushi), Adverb taking the 'to' particle
entirely; completely; wholly
Also written 丸丸【まるまる】