Sentence:  This semitone was termed by the Pythagoreans <WSD>apotome</WSD>, and the diatonic semitone was termed limma. They contended, that the <WSD>apotome</WSD>, or distance from B flat to B natural, was larger than the limma, or distance from A to B flat. 
Meaning of the word marked with <WSD> tags:  The remaining part of a whole tone after a smaller semitone has been deducted from it; a major semitone.