nirls
/nəːlz/Scottish and Irish English (northern )
noun
With singular or (occasionally) plural concord. A disease causing a rash of spots or pustules on the skin; especially measles or chickenpox.
Origin
Late 16th century; earliest use found in Alexander Montgomerie (c1550–1598), poet and courtier. Probably a variant of knurls, plural of knurl (although this is first attested slightly later).