lunette

Noun
  1. Temporary fortification like a detached bastion (synset 103703146)
    is a type of: fortification, munition - defensive structure consisting of walls or mounds built around a stronghold to strengthen it
  2. Oval or circular opening;
    To allow light into a dome or vault (synset 103702999)
    is a type of: opening - a vacant or unobstructed space that is man-made
    is a part of: vault - an arched brick or stone ceiling or roof
    same as: fenestella

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