Sentence:  It is well known that a Peano space is a <WSD>cactoid</WSD> if and only if each of its true cyclic elements is a 2-sphere. 
Meaning of the word marked with <WSD> tags:  A locally connected continuum that is the closure of the union of an at most countable number of spheres and simple arcs, of which every simple closed contour is contained in one and only one of the spheres.