(Christianity) A luna: a crescent-shaped receptacle, often glass, for holding the (consecrated) host (the bread of communion) upright when exposed in the monstrance. [from 19th c.]
A type of flattened glass used in watch-making. [from 19th c.]
The circular hole in the guillotine in which the victim's neck is placed. [from 19th c.]
(geology) A type of crescent-shaped dune blown up along a lake basin, especially in dry areas of Australia. [from 20th c.]