adj

• (Northern England, archaic) Of corn or other grains: so dry as to fall out of the ear with handling.
• (obsolete, rare)
  "My Lord, I ſcarce haue leiſure to ſalute you, / My matter is ſo raſh: […]"
• (obsolete, rare)
  "[T]he vnited veſſel of their bloud, / […] / Shall neuer leake, though it doe vvorke as ſtrong, / As Aconitum, or raſh gunpovvder."

adv

• (archaic) Synonym of rashly (“in a rash manner; hastily or without due consideration”).
  "Soft Gooddie Sheepe (then ſaid the Foxe) not ſoe: / Vnto the King ſo raſh ye may not goe, / He is vvith greater matter buſied, / Than a Lambe, or the Lambes ovvne mothers hed."

noun

• (dermatology, medicine) An area of inflamed and irritated skin characterized by reddened spots that may be filled with fluid or pus. Also, preceded by a descriptive word (rare or obsolete), an illness characterized by a type of rash.
  "He came out in a rash because of an allergy."
• (figuratively)
• (figuratively)
  "There has been a rash of vandalism lately."

noun

• (historical) Chiefly preceded by a descriptive word: a fabric with a smooth texture woven from silk, worsted, or a mixture of the two, intended as an inferior substitute for silk.
  "cloth rash    silk rash"