LIGNUM VITAE Meaning of LIGNUM VITAE in English [lig.num vi.tae] n, pl lignum vitaes [NL, lit., wood of life] (1594) 1: the very hard heavy wood of any of several tropical American guaiacums 2: a tree yielding lignum vitae Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012