(organic chemistry) The aliphatic aldehyde that has 15 carbon atoms

(organic chemistry) Any of several isomeric aliphatic ketones having fifteen carbon atoms

(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.

plural of pentadecahydrate

plural of pentadecanone