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underlying▼(lying underneath)adjective[UK: ˌʌn.də.ˈlaɪ.ɪŋ] [US: ˌʌn.dər.ˈlaɪ.ɪŋ]
substratum [substrata]▼(a layer that lies underneath another)noun[UK: ˌsʌb.ˈstrɑː.təm] [US: ˌsʌb.ˈstrɑː.təm]
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