Definition: a class of irregular compound words headed by the compound word पात्रेसमित, which are taken correct as they are. This class of words consists mostly of words forming a tatpurușa compound which cannot be explained by regular rules. The class is called आकृतिगण and hence similar irregular words are included in it: e. g. पात्रेसमिताः, गेहेशूरः कूपमण्डूकः etc cf. KS. on P. II.1.48.