(biochemistry, genetics) A nucleic acid strand which terminates at the chemical group attached to the fifth carbon in the sugar ring.

(biochemistry) A specially altered nucleotide end to the 5′ end of precursor messenger RNA and some other primary RNA transcripts as found in eukaryotes and caliciviruses, vital to creating mature messenger RNA which is then able to undergo translation.

(computer hardware) A twisted pair cable for carrying signals, particularly for Ethernet-based computer networks.

(geometry) A four-dimensional polytope, analogous to a tetrahedron, whose five bounding facets are tetrahedra.

plural of 5-cell

(pathology) Abbreviation of parainfluenza virus 5.

A member of the Five-Percent Nation, a cultural movement influenced by Islam, founded in 1964 in New York City.

(biochemistry) Initialism of 5-hydroxytryptamine.

plural of 5-K

(sports) Alternative form of 5K.