lenticle

[len-ti-kuh l]
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noun

a window in a clock case revealing the motion of the pendulum bob.

Origin of lenticle

< Latin lenticula lentil, equivalent to lenti- (stem of lēns; see lens) + -cula -cle1
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British Dictionary definitions for lenticle

lenticle

noun

geology a lens-shaped layer of mineral or rock embedded in a matrix of different constitution
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012