noun
reminiscences; talking about old times
A somewhat literary or formal term for nostalgic conversation about the past.
同窓会で懐旧談に花が咲いた。
At the class reunion, we had a lively talk about old times.
昔話 is a more common, everyday word for old tales or reminiscing, while 懐旧談 is a formal, literary term specifically for nostalgic conversation.
Compound of 懐旧 (nostalgia) and 談 (talk, discussion).