You searched for: “gills”
A unit related to: “gills”
(Greek: gills)
Word Entries at Get Words containing the term: “gills”
book gill (s)  (noun), book gills (pl)
The breathing area in some arachnids, resembling a book lung but on the outside of the body: A book gill is found in horseshoe crabs and is made up of membranous folds.
This entry is located in the following unit: Insects, General Applicable Terms (page 2)