Arbor day arbor day • arboreal · · · Info · Definitions · Characters · · Arbor day · · Text Common · · Latin · · Scripts 9 · · Length 3 · · Syllables Definitions · · · (noun) a day designated for planting trees. Synonyms: Arbor Day. · · Noun Definition 1 Characters · · space U+0020 A latin capital letter a U+0041 a latin small letter a U+0061 b latin small letter b U+0062 d latin small letter d U+0064 o latin small letter o U+006F r latin small letter r U+0072 y latin small letter y U+0079