- layer found in some shells - Mother of pearl - Mother-of-pearl - Oyster product - A pearly substance which lines the interior of many shells,
and is most perfect in the mother-of-pearl. [Written also nacker and
naker.] See Pearl, and Mother-of-pearl.
- 30th wedding anniversary gift, traditionally - Appear later holding oyster’s stone - Concretion of nacre - Gem in shell could be paler - Lustrous gem - Mass of nacre - Oyster gem