a. rare. [irreg. formed as if on a Gr. ἀτοματ-, which does not exist; cf. schism, -atic, prism, -atic.] = ATOMIC.
1862. R. Patterson, Ess. Hist. & Art, 10. Those substances which are the most ethereal in their atomatic structure … vibrate most readily.
1881. Williamson, in Nature, No. 618. 414. An atomatic formula of its composition.
