Dictionary.net

• The tertiary lung tubes of Birds, their terminations being embedded in the lung mesenchyme.

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

• [Greek] The tertiary lung tubes of Birds, their terminations being embedded in the lung mesenchyme (zool.).

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