一円[ichien] one yen
一円玉[ichiendama] one-yen coin
一円札[ichiensatsu] one-yen bill
円か[madoka] round
円やか[maroyaka] round

円グラフ[engurafu] pie graph
円安[enyasu] cheap yen
円為替[engawase] yen exchange
円域[eniki] yen bloc

円錐[ensui] cone
円錐[marugiri] round gimlet
円錐曲線[ensuikyokusen] conic curve
円錐形[ensuikei] cone
円錐体[ensuitai] cone

角錐[kakusui] pyramid
三角錐[sankakusui] triangular pyramid
円錐台[ensuidai] circular truncated cone
立錐[rissui] setting a drill bit

その反面[sonohanmen] on the other hand
委細面談[isaimendan] details when I see you
一面[ichimen] one face
一面観[ichimenkan] one-sided view
一面識[ichimenshiki] (a) passing acquaintance

隠面[inmen] hidden surface
右面[umen] right side
液面[ekimen] liquid surface
凹面[oumen] concavity
凹面鏡[oumenkyou] concave mirror