LABURNUM Meaning of LABURNUM in English la ‧ bur ‧ num /ləˈbɜːnəm $ -ɜːr-/ BrE AmE noun [uncountable and countable] a small tree with long hanging stems of yellow flowers and poisonous seeds Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012