幼形成熟 ようけいせいじゅく Meanings Noun neoteny See also: ネオテニー. Kanji 幼 infant. Read as ヨウ. 形 shape. Read as ケイ. 成 become. Read as セイ. 熟 ripe. Read as ジュク. Word lists Biology Jinuma: Japanese Dictionary · Word lists