riða

I)

(að), v. to tremble, move unsteadily (riðuðu augu).

II)

f. shivering fever, ague.

* * *

u, f. a shivering fever, ague. El. 1, MS. 544. 39, Sks. 137: in mod. usage the trembling of the head and hands from age or infirmity.

COMPDS: riðusjúkr, riðusótt.