The term ROSE BARB is a combination of two words, 'ROSE' and 'THORN'. The word 'ROSE' refers to the flower of the same name, which is known for its beauty and fragrance. The word 'THORN' refers to the sharp, pointed projections that grow on some plants, such as roses. Together, the two words form a metaphor for something that is both beautiful and dangerous. The crossword solution for the term ROSE BARB is THORN, which is a five-letter word that accurately describes the dual nature of the metaphor.