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planoconcave meaning in Arabic

EnglishArabic
Planoconcave [UK: ˈpleɪ.nəʊˈk.ɒnk.eɪv]
[US: ˌpleɪno.ʊˈk.ɑːnk.eɪv]

مسطّح من جهة و مقعّر من جهة أُخرى