frameshift
adjective
frame·shift ˈfrām-ˌshift 
: relating to, being, or causing a mutation in which a number of nucleotides not divisible by three is inserted or deleted so as to change the reading frame of some triplet codons during genetic translation
frameshift noun
Word History
First Known Use
1965, in the meaning defined above
Medical Definition
frameshift
adjective
frame·shift -ˌshift
: relating to, being, or causing a mutation in which a number of nucleotides not divisible by three is inserted or deleted so that some triplet codons are read incorrectly during genetic translation
frameshift mutations
frameshift mutagens