helleboraster|ˌhɛlɪbɒˈræstə(r)| [mod.L., f.hellebor-us hellebore + -aster.] The Fetid Hellebore or Bear's foot (Helleborus fetidus). 1663–4E. Browne in Sir T. Browne's Wks. (1848) III. 402, I saw Helleboraster in flower.1823Mechanics' Mag.No. 11. 175 To try helleboraster, milk-thistle, henbane, etc.