thorn

Universal Words noun 1 [C] a small sharp pointed part on the stem of some plants, such as roses 2 [C,U] a tree or bush that has thorns: an old hedge of thorns * a thorn tree seealsoBLACKTHORN, HAWTHORN IDIOMS a thorn in sb's flesh / side a person or thing that repeatedly annoys sb or stops them from doing sth