• Bengali Word বিস্তার English definition (noun) 1 spreading; extent; expansion; stretching; stretch; expanse; spread. 2 width; breadth; amplitude. 3 specification; detailed description/ enumeration. বিস্তার করা (verb transitive) spread out; stretch; expand; extend; enlarge; expatiate upon; propagate; peak diffusely about. বিস্তারন (biology) distribution. বিস্তারিত (adjective) ‘spread; extended; detailed; fully stated; elaborated; amplified. বিস্তারী (adjective) stretching over/ through; spreading; diffusing; extending; large.