Sentence:  [...] a gramm. term, implying the use of the old letter &#39;<WSD>vend</WSD>&#39; in spelling v-rungu, v-rangr, v-reiðr, see introduction to letter R; ... 
Meaning of the word marked with <WSD> tags:  The letter Ꝩ/ꝩ, used in Old Norse, related to the rune wynn (ᚹ, whence also Latin-script Ƿ/ƿ) but with the bowl open at the top, like a y.