concave
plural of Fogelman
plural of oedipodid
curved like the inner surface of a sphere or bowl / (geometry, not comparable, of a polygon) not convex; having at least one internal angle greater than 180 degrees.
(historical, rare) A German representative of the Frankish king (or, later, the Holy Roman Emperor), in a palatial domain of the crown; a count palatine.
凹面鏡は太陽光を明るい焦点に集めた。
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