(Greek: prefix; no, absence of, without, lack of; not)

(From Latin: "to, toward, a direction toward, an addition to, near, at"; and changes to: "ac-, af-, ag-, al-, an-, ap-, aq-, ar-, as-, at-" and ad- is also combined with certain words that begin with the letters c, f, g, l, n, p, q, r, s, and t.)

(Greek: up, upward; back, backward, against; again, anew; used as a prefix)

(Latin: ring, an iron ring for the feet; circle; (so called because of its form); usually the posterior opening of the alimentary canal through which undigested food is voided; the anus)