Pyknic - 1. Having a rounded build or body structure 2. A person of the pyknic type.
Pomona Sprout was well-liked at Hogwarts by nearly all the students. She was, after all, a true Hufflepuff and not only hard-working and loyal, but also fair and just in all her judgements.
Even her weight wasn't a problem. No one would have dreamed of teasing her about it. It was just a shame she liked wearing green so much.
Oh, everyone knew there was a reason – green didn't show the dirt of her work as much as pale blue or lilac would have done – but that didn't stop unnecessarily cruel or drunken students referring to her as Professor "Brussel Sprout"