ちょっけい

ちょっけい 【直系 】a direct line [descent ].▸ 直系の子孫 a direct descendant ｟of ｠.直系会社 a directly affiliated company .

ちょっけい

ちょっけい 【直径 】〘数学 〙a di á meter .▸ 直径10センチの木の幹 a tree trunk (which is ) ten centimeters in diameter .会話 ▸ 「直径はいくらですか 」「5センチです 」“How wide across is it? / How wide is it in diameter ? / What is its diameter ?” “It's five centimeters (across [in diameter ]).”