Sentence:  And here alſo you may obſerv, that the ſyllable which is doubled in the Preterperfect tenſ is not doubled in the <WSD>Supines</WSD>, as "totondi" to clip, make's "tonſum": "cecídi" to beat, "cæſum": ... 
Meaning of the word marked with <WSD> tags:  In Latin and other languages: a type of verbal noun used in the ablative and accusative cases, which shares the same stem as the passive participle.