(organic chemistry) Any alkene that has fifteen carbon atoms and one double bond, but especially 1-pentadecene or cis 7-pentadecene

(organic chemistry) A saturated aliphatic alcohol that has fifteen carbon atoms, but especially 1-pentadecanol

(organic chemistry, especially in combination) The univalent radical derived from pentadecanoic acid by loss of the hydroxy group

(inorganic chemistry) Any oxide containing fifteen atoms of oxygen per molecule, O₁₅.

(inorganic chemistry) Any selenide containing fifteen atoms of selenium per molecule, Se₁₅.

(inorganic chemistry) Any sulfide containing fifteen atoms of sulfur per molecule, S₁₅.

(geometry) A polyhedron with fifteen faces.

(organic chemistry) Relating to the pentadecyl radical

pentadactylous

(organic chemistry) Any alkyne that has fifteen carbon atoms