DURAMEN
\djˈʊ͡əɹe͡ɪmˌɛn], \djˈʊəɹeɪmˌɛn], \d_j_ˈʊə_ɹ_eɪ_m_ˌɛ_n]\
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the older inactive central wood of a tree or woody plant; usually darker and denser than the surrounding sapwood
By Princeton University