Sentence:  The loss of ȝ between a front vowel and t, which Wyld finds in the middle of the fifteenth century but assigns to an earlier date,35 is shown by both rhyme and spelling in "knyght:whight" (white) 562-63. The <WSD>reverse spelling</WSD> occurs again in "whiȝte" 566. 
Meaning of the word marked with <WSD> tags:  A specific spelling of a word representing a phonetic feature never present in it, but present in other words in the same phonetic environment (and later lost); an inverse spelling.