Definitions

1. noun

A calcium carbonate plate or scale, typically circular or hexagonal in shape, produced by the coccolithophores, a group of marine algae.

“The scientist studied coccoliths under a microscope to learn more about the ancient ocean’s ecosystem.”

2. noun

A fossilized coccolith, often found in sedimentary rocks.

“The geologist discovered a layer of coccoliths in the rock formation that dated back millions of years.”