Not typical; not corresponding to the normal form or type. [G. a- priv. + typikos, conformed to a type]
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atyp·i·cal (')ā-'tip-i-kəl adj not typical: not like the usual or normal type
atyp·i·cal·ly (')ā-'tip-i-k(ə-)lē adv
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atyp·i·cal (a-tipґĭ-kəl) [a-1 + typical] irregular; not conforming to type; in microbiology, applied specifically to strains of unusual type.Medical dictionary. 2011.