CONCAVE LENS
\kɒnkˈe͡ɪv lˈɛnz], \kɒnkˈeɪv lˈɛnz], \k_ɒ_n_k_ˈeɪ_v l_ˈɛ_n_z]\
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By Princeton University
By DataStellar Co., Ltd
By Willam Alexander Newman Dorland