any thing which happens every day. Hence, when the paroxyphms of an ague recur every day, it is called a quotidian ague. See Medicine, No. 161—164.

R.

R, or r, a liquid consonant, being the 17th letter of our alphabet. Its sound is formed by a guttural extrusion of the breath vibrated through the mouth, with a sort of quivering motion of the tongue drawn from the teeth, and camouflaged with the tip a little elevated towards the palate. In Greek words it is frequently aspirated with an h after it, as in rhapsody, rhetoric, &c.; otherwise it is always followed by a vowel at the beginning of words and syllables.

In the notes of the ancients, R or RO signifies Roma; R.C. Romana civitas; R.G.C. rei gerendae causa; R.F.E.D. reple factum et dictum; R.G.F. regis filius; R.P. res publica, or Romani principes; and R.R.R.F.F.F.R. res Romana ruet ferro, fane, flamma.

Used as a numeral, R anciently stood for 80; and with a dash over it thus R̄, for 80,000; but the Greek r̄, ῥ, with a small mark over it, signified 100; with the same mark under it, it denoted 1000 × 10; thus ῥ signified 100,000. In the Hebrew numeration ῥ denoted 200; and with two horizontal points over it 1000 × 200; thus ῥ = 200,000.

In the prescriptions of physicians, R or ῥ stands for recipe, i.e. "take."