genus Xanthium
— Noun
– English
～ coarse herbs having small heads of greenish flowers followed by burrs with hooked bristles
genus Xanthomonas
— Noun
– English
～ a genus of bacteria similar to Pseudomonas but producing a yellow pigment that is not soluble in water
genus Xanthorroea
— Noun
– English
～ grass trees; sometimes placed in family Xanthorrhoeaceae
genus Xanthosoma
— Noun
– English
～ tropical American tuberous perennials
genus Xenicus
— Noun
– English
～ type genus for the Xenicidae
genus Xenopus
— Noun
– English
～ an African clawed frog; in some classifications made the type genus of a separate family Xenopodidae
genus Xenorhyncus
— Noun
– English
～ East Indian and Australian storks
genus Xenosaurus
— Noun
– English
～ type and sole genus of Xenosauridae: slender-bodied Mexican lizards having the upper surface covered with tiny granules and tubercles
genus Xeranthemum
— Noun
– English
～ genus of annual densely hairy herbs of Mediterranean to southwestern Asia
genus Xerobates
— Noun
– English
～ possible new genus for desert and Texas tortoises based on recent research
genus Xerophyllum
— Noun
– English
～ small genus of North American herbs having grasslike basal leaves: squaw grass; sometimes placed in family Melanthiaceae
Gregory XII
— Noun
– English
～ the Italian pope from 1406 to 1415 who worked to end the Great Schism and who retired to make it possible (1327-1417)
Gregory XIII
— Noun
– English
～ the pope who sponsored the introduction of the modern calendar (1572-1585)
genus Xiphias
— Noun
– English
～ type genus of the Xiphiidae
Gregory XVI
— Noun
– English
～ Italian pope from 1831 to 1846; conservative in politics and theology; worked to propagate Catholicism in England and the United States (1765-1846)
genus Xylaria
— Noun
– English
～ type genus of Xylariaceae; fungi with perithecia in the upper part of erect black woody stromata