has part has part has_part characteristic of has modifier adactyly absence of digits There is ambiguity in the literature regarding the meaning of the term adactyly. Some sources define this as missing all digits and other sources list the definition as missing all or one or more digits. In this ontology, we are using the latter, more inclusive definition, even though this may confound the usage of the term oligodactyly MP:0000565. missing one or more digits, or all digits Fyler:4173 absent toes MPheno.ontology absent fingers MP:0000561 abnormal digit morphology abnormal absent digit