| 单词 | book gill |
| 释义 | > as lemmasbook gill book gill n. Zoology (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. ΘΚΠ the world > animals > invertebrates > phylum Arthropoda > order Xiphosura or Merostomata > [noun] > genus Limulus > member of > parts of > respiratory organ book gill1897 1897 T. J. Parker & W. A. Haswell Text-bk. Zool. I. xi. 621 External appendages or gills (book-gills). 1960 D. C. Braungart & R. Buddeke Introd. Animal Biol. (ed. 5) 379 Arthropods having four pairs of legs; tracheae, book-lungs, or book-gills. 2002 G. M. Eberhart Mysterious Creatures I. 125/1 Ancestors of the True scorpions..were once primarily aquatic and were equipped with organs called book gills. < as lemmas |
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