This inner substance has nacre, which is a naturally forming material that gives mother of pearl its distinct iridescent appearance. Find 11 ways to say IRIDESCENT, along with antonyms, related words, and example sentences at Thesaurus.com, the world's most trusted free thesaurus. the conventional term would be âadjective 1. displaying a play of lustrous colors like those of the rainbow. Nacre (/ Ë n eɪ k Ér / NAY-kÉr also / Ë n æ k r É / NAK-rÉ), also known as mother of pearl, is an organicâinorganic composite material produced by some molluscs as an inner shell layer; it is also the material of which pearls are composed. âmother-of-pearl buttonsâ More example sentences Substance definition is - essential nature : essence. Mother of pearl is not an actual stone, but rather, is a substance. This substance is formed on the inside of the shell of many mollusks and has an iridescent appearance to it. It is used to make... | Meaning, pronunciation, translations and examples ânoun 2. an iridescent cloth, material, or other substance: new fall dresses of imported iridescents. Like the pearl it is a secretion of the mantle, composed ⦠A smooth shining iridescent substance forming the inner layer of the shell of some mollusks, especially oysters and abalones, used in ornamentation. Hygroscopic substance - definition This is when substances absorb water from air, but not enough to form solutions. A pattern of psychoactive substance use that is causing damage to health. The damage may be physical (e.g. Objective: The objective of the article is to present the available data from the literature on substance use disorders in healthcare professionals. , the iridescent substance that forms the lining of the shells of some fresh-water and some salt-water mollusks. depressive episodes secondary to heavy alcohol intake). Definition. How to use substance in a sentence. Abrasion: ... A type of ornamental glass with an iridescent surface made by spraying the glass with stannous chloride or lead chloride and reheating it under controlled atmospheric conditions. Aurene was developed by Frederick Carder (1863-1963) at Steuben Glass Works in Corning, New York, in 1904. Letâs start with a definition. All Free. Definition / Description. iridescent - WordReference English dictionary, questions, discussion and forums. Examples of such substances include C a O, N a N O 3 , N a C l, sucrose and CuO.Also, certain liquid substances absorb water from the air to get diluted, these are also regarded as ⦠It is strong, resilient, and iridescent.. Nacre is found in some of the most ancient lineages of bivalves, gastropods, and cephalopods. Mother-of-pearl definition: Mother-of-pearl is the shiny layer on the inside of some shells. hepatitis following injection of drugs) or mental (e.g. Prevalence, risk factors, treatment options, and reentry into clinical practice are discussed.