noun
: a fossil coral (genus Halysites ) common in the upper Ordovician and Silurian rocks having tubular corallites of oval section united by their narrow sides and looking like links of chain
noun
: a fossil coral (genus Halysites ) common in the upper Ordovician and Silurian rocks having tubular corallites of oval section united by their narrow sides and looking like links of chain
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012