Definition of pupillary substitution in US English:

pupillary substitution

(also substitution pupillary)

noun

Civil Law Scottish Law
historical
  • Nomination of a substitute to take the place of someone who dies before inheriting, or succeeds as heir but then dies before attaining puberty.

Origin

Mid 17th century. After classical Latin substitūtiō pūpillāris; compare Spanish sustitución pupilar, French substitution pupillaire.