a. Zool. [f. Gr. ἀ priv. + γαστήρ, γαστρ-ός belly + -IC.] Having no distinct alimentary canal.
1836. Todd, Cycl. Anat. & Phys., I. 43/1. Such pulmograda as … were formerly supposed to be agastric.
1867. J. Hogg, Microsc., II. ii. 371. In … agastric Infusoria only solid alimentary particles are taken as food.
