book gill
Zoology
noun
(In aquatic arachnids) any of several pairs of external gills that each contain numerous fine lamellae; also called gill book.
- Now only found in horseshoe crabs, book gills are thought to be ancestral to book lungs..
Origin
Late 19th century.
- rattle-broom
- rattle bush
- rattle-clap
- rattle-free
- rattle-gourd
- rattle grass
- rattle-head
- rattle-headed
- rattlejack
- rattle-mouse
- rattle-note
- rattle on/away
- rattle one's dags
- rattle-pated
- Truffaut, François
- truffière
- truffle
- truffle bed
- truffle beetle
- truffled
- truffle dog
- truffle fly
- truffle ground
- truffle hound
- truffle oil