Sentence:  The Thyrsus , or <WSD>Thyrse</WSD>, is a mode of inflorescence very nearly allied to the panicle, being, in fact, a panicle contracted into an ovate, or egg-shaped form. In the <WSD>thyrse</WSD>, the middle footstalks, which are longer, extend horizontally, whilst the upper and lower oes are shorter, and rise up vertically. 
Meaning of the word marked with <WSD> tags:  A type of inflorescence; a compact panicle having an obscured main axis and cymose subaxes.