From ZooTerms (Dictionary of Invertebrate Zoology)
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cardia (noun; Greek kardia, heart): 1. (Arthropoda: Insecta) An anterior cardiac chamber of the midgut of Diptera; the proventriculus of some authors.

2. (Bryozoa) Part of the digestive tract into which the esophagus opens, sometimes differentiated into gizzard and stomach.

3. (NEMATA) The esophago-intestinal valve.