Word History: Every native speaker knows that the cardinal three and the ordinal third are closely related, but many may wonder why the r comes before the vowel in the former and after in the latter. What we have here is metathesis, the switching of the order of two sounds. This is a common occurrence in languages, and especially so in English with the consonant r. In Old English, three was thrīe, and third was thridda. Thridda would have given us thrid in Modern English except for the metathesis of r and i. This metathesis began in Old English times in Northumbria: thridda appears as thirdda in Northumbrian manuscripts. The metathesis spread south during Middle English times and also affected many other words, including bird (originally bridd in Old English and in Chaucer's Middle English), and nostril, literally "nose hole" (from Old English thyrl). Metathesis even produced the curious form throp from thorp, "village," which survives in the proper name Winthrop.