Definitions

1. noun

A protein in certain invertebrates, such as earthworms, that contains no hemoglobin.

“In studying the earthworm’s biology, researchers discovered the presence of achroglobin, which helps the worm’s circulatory system function.”

2. noun

A hemoglobin-like protein found in certain invertebrates, such as earthworms.

“Earthworms use achroglobin as a transport molecule to deliver oxygen throughout their bodies.”