semiconservative Syllabification: (sem·i·con·serv·a·tive)Pronunciation: /ˌsemēkənˈsərvətiv, ˌsemˌī-/Definition of semiconservative adjective Biochemistry relating to or denoting replication of a nucleic acid in which one complete strand of each double helix is directly derived from the parent molecule. Derivatives semiconservatively adverb semiconservative in other Oxford dictionaries Definition of semiconservative in the British & World English dictionary