non-covalent
/ˌnɒnkəʊˈveɪlənt/ /ˌnɒnkəʊˈveɪl(ə)nt/Chemistry and Biochemistry
adjective
Not of the nature of or involving a covalent bond.
Origin
1950s; earliest use found in Proceedings of the National Academy of Sciences of the United States of America. From non- + covalent.