فَـ«نَدْمَانٌ» مُنْصَرِفٌ؛ لِوُجُودِ «نَدْمَانَةَ».
Translation: Nadmān is fully declinable because its feminine form nadmāna exists.
This is the sense of nadmān meaning a companion (nadīm). The source’s marginal note gives a different ruling for another meaning.