Haematoxylon hae·ma·to·xylon uncommon noun 1. small genus of tropical American spiny bushy shrubs or trees SynonymsHaematoxylumgenus Haematoxylumgenus Haematoxylon Related words Broader terms rosid dicot genus Parts Caesalpinioideae Part of logwood WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.