a doctor who administers agents that cause loss of sensation during surgery anasthesiologist a doctor specializes in treatment of disease using high-energy radiation
The word phylum (plural: phyla) is a category used to classify marine organisms. In this article, you can learn the definition of phylum, how it is used, and examples of phyla used to categorize marine life.
2. phylum - (biology) the major taxonomic group of animals and plants; contains classes. phylum Pyrrophyta, Pyrrophyta-a division of lower plants comprising unicellular and biflagellate algae that form starchy compounds.