catkin

n tuft of soft downy flowers hanging from the twigs of such trees as willows or birches 柔荑花序（垂於柳树或桦树枝头的软毛花穗）, 柳絮.

category, cater, caterer, catering, caterpillar, caterwaul, catfish, catgut, Cath, catharsis, cathartic, cathedral, Catherine wheel, catheter, catheterize, -ise, cathode, cathode ray, Catholic, Catholicism, catholicity, catmint, catnap, catnip, cats-paw, catsuit, catsup, cattily, cattiness, cattle, cattle-cake, cattle-grid, catty, catwalk, Caucasian, caucus, caught, caul, cauldron (also caldron), cauliflower, cauliflower cheese,