Initialism of unlocked nucleic acid.
"The researcher analyzed the stability of una, an initialism referring to unlocked nucleic acid, in various pH environments."
"She bought a una to help her carry groceries up the stairs."
A female given name from Irish.
"Una is an ancient Irish female given name that has been carried by several royal saints throughout history."
Una is an Anglicized version of the Irish name Úna and serves as a doublet of the name Oona. The word entered English directly from Ireland without a change in its original meaning.