'single-petaled' originates from English, specifically the words 'single' and 'petal', where 'single' ultimately comes from Latin 'singulus' meaning 'one' and 'petal' comes from Greek 'petalon' meaning 'leaf' or 'leaf-like part'.

'single' passed into English via Latin 'singulus' and Old French/Middle English forms (e.g. Middle English 'single'); 'petal' was coined in botanical New Latin from Greek 'petalon' and entered modern English as 'petal'; these were combined in modern English to form the compound 'single-petaled'. Translated: 「single」はラテン語 'singulus' → 古フランス語／中英語を経て現代英語になり、「petal」はギリシャ語 'petalon' が博物学の新ラテン語で 'petal' となり現代英語に入った語であり、これらが結合して現代英語の『single-petaled』が作られた。

Originally 'petalon' meant 'leaf' in Greek; over time the sense specialized to mean a 'segment of a flower (petal)'. 'Single-petaled' therefore developed to describe flowers with a single whorl or single layer of such petals.