rosehip

A large rosebush sits at the entrance to the park, when it's in bloom, we always stop to sniff it. In April last year, I noticed Meg taking a great interest in the rosehips left on the branches after the roses had shed their petals.
"rosehips" と言う単語は知りませんでしたが、この文を読むだけでバラの実である事が分かります。
一応辞書を見ます。
The fruit of a rosebush, especially of the English dog-rose (Rosa canina); called also rose hip. [Written also hop, hep.][1913 Webster]
Online Etymology によると元々"hip" に "seed pod" (especially of wild rose) の意味があるとありました。