adactyly Fyler:4173 MP:0000561 MPheno.ontology 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. absence of digits absent fingers absent toes missing one or more digits, or all digits abnormal digit morphology