granum

noun2

1. •
   A stack-like structure in plant chloroplasts that contain chlorophyll; the site of photosynthesis.
2. •
   (no longer used) One's grandmother.

   • Each of 'em has a sev'ral Gin, / To catch Intelligences in. / Some by the Nose vvith fumes trapan 'em, / As Dunstan did the Devils Grannum. — 1663