I believe that Guest JTT is correct, it was a farm implement for chaffing wheat. The word Bodhran means 2 things in Irish
1 - Bodhran m- deaf person 2 - Bodhran m - hand drum - fada over the a in both cases.
other related words are
bodhar - deaf/numb bodhaire - deafness bodhraigh - deafen, annoy, deaden bodhranai - bodhran player