HEAVISIDE LAYER

\hˈɛvɪsˌa͡ɪd lˈe͡ɪə], \hˈɛvɪsˌa‍ɪd lˈe‍ɪə], \h_ˈɛ_v_ɪ_s_ˌaɪ_d l_ˈeɪ_ə]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd