PLANOCONCAVE LENS
\plˈanəkˌɒnke͡ɪv lˈɛnz], \plˈanəkˌɒnkeɪv lˈɛnz], \p_l_ˈa_n_ə_k_ˌɒ_n_k_eɪ_v l_ˈɛ_n_z]\
Word of the day
Snake's-head
- Guinea-hen flower; -- so called in England because its spotted petals resemble the scales of a snake's head.