genus Haemanthus ge·nus·hae·manthus uncommon noun 1. genus of African deciduous or evergreen bulbous herbs: blood lilies SynonymsHaemanthusgenus Haemanthus Related words Broader terms liliid monocot genus Parts Amaryllidaceae Part of blood lilyCape tulip WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.