li·mon·ci·llo \ˌlēmōnˈsē(ˌ)(y)ō\noun (-s) Etymology: American Spanish, diminutive of Spanish limón lemon, from Arabic laymūn 1. a.: any of several tropical American fruit or timber trees b.Puerto Rico: bayberry 1 2.Southwest: any of several yellow-flowered composite plants (genus Pectis) with strongly lemon-scented foliage; especially: chinchweed