The Collaborative International Dictionary
Metagastric
Metagastric \Met`a*gas"tric\, a. [Pref. meta- + gastric.] (Zo["o]l.) Of or pertaining to the two posterior gastric lobes of the carapace of crabs.
Wiktionary
metagastric
a. (context zoology English) Of or pertaining to the two posterior gastric lobes of the carapace of crabs.