lu·nette /luˈnɛt/
 眼鏡堡,弦月窗,半圓壁


 Lu·nette n.
 1. Fort. A fieldwork consisting of two faces, forming a salient angle, and two parallel flanks. See Bastion.
 2. Far. A half horseshoe, which lacks the sponge.
 3. A kind of watch crystal which is more than ordinarily flattened in the center; also, a species of convexoconcave lens for spectacles.
 4. A piece of felt to cover the eye of a vicious horse.
 5. Arch. Any surface of semicircular or segmental form; especially, the piece of wall between the curves of a vault and its springing line.
 6. An iron shoe at the end of the stock of a gun carriage.
 Lunette window Arch., a window which fills or partly fills a lunette.

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 lunette
      n 1: temporary fortification like a detached bastion
      2: oval or circular opening; to allow light into a dome or
         vault [syn: fenestella]