Dictionary.net

• A slender flexible rod of organic substance forming a supporting axis for the body of many Flagellates.

1920 - A dictionary of scientific terms.
By Henderson, I. F.; Henderson, W. D.

• [Greek] A slender flexible rod of organic substance forming a supporting axis for the body of many Flagellata.

1920 - A dictionary of scientific terms (6th edition)
By J.H. Kenneth