Definition of Ichthyolite:

part of speech: noun

A fossil fish, or any portion of a fish, as a scale, a tooth, a spine, & c.

Usage examples:

• When we reflect on the hundreds of Mollusks, Echinoderms, Trilobites, Corals, and other fossils already obtained from more ancient Silurian formations, Upper, Middle, and Lower, we may well ask whether any set of fossiliferous rocks newer in the series were ever studied with equal diligence, and over so vast an area, without yielding a single ichthyolite Sir Charles Lyell in "The Student's Elements of Geology".