An adult who cares for a child who has been placed in foster care.

One's spouse's parent.

A parent who pays an inordinate amount of attention to their children and often makes decisions, particularly educational ones, normally the province of the student.

The love of parents towards their children. / (by extension) Love which is similar to parental love.

(botany) The plant that contributes male reproductive material, the pollen.

A child's natural parent, either the male who supplied the sperm or the female who supplied the egg which interacted for the child's conception.

(chemistry) The simplest member of a class of compounds, from which the others are formally obtained by substituting radicals for hydrogen atoms.

plural of parent company

(business) A company that owns or controls one or more other companies.

(slang) A person who spends money for the benefit of a younger person, typically in exchange for companionship and/or sexual favors.