In the context of redox reactions, the removal of hydrogen from a substance is known as

The removal of hydrogen from a substance is “oxidation”.

Ex: $\text{Pb\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}}+{\text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}H}}_{\text{2}}\text{S\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}}\to {\text{\hspace{0.17em}\hspace{0.17em}PbS\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}+\hspace{0.17em}\hspace{0.17em}H}}_{\text{2}}$

Removal of H atoms from ${\text{H}}_{\text{2}}\text{S}$ will make that S atom gets oxidation ($-\text{2\hspace{0.17em}to\hspace{0.17em}0}$).