Words related to an-

anorectic (adj.)
"characterized by want of appetite," 1832, medical Latin, from Greek anorektos "without appetite," from an- "not, without" (see an- (1)) + orektos, verbal adjective of oregein "to long for, desire" (see anorexia). As a noun, attested from 1913.
anorexia (n.)
1590s, "morbid want of appetite," Modern Latin, from Greek anorexia, from an- "without" (see an- (1)) + orexis "appetite, desire," from oregein "to desire, long for," literally "reach out (one's hand), stretch oneself, stretch out for" (from PIE root *reg- "move in a straight line") + abstract noun ending -ia. In current use, often short for anorexia nervosa.
anosmia (n.)

"loss of sense of smell," 1811, Modern Latin, from Greek an- "not, without" (see an- (1)) + osmē "smell" (Doric odmē), from *odsme, from PIE root *hed- "to smell" (see odor) + abstract noun ending -ia.

anoxic (adj.)
"characterized by or causing lack of oxygen in tissues," 1920, medical Latin, from Greek an- "not, without" (see an- (1)) + first two letters of oxygen + -ic. Anoxia "oxygen deficiency" is attested from 1931.
anuria (n.)
"absence of urination," 1838, medical Latin, from Greek an- "not, without" (see an- (1)) + ouron "urine" (see urine) + abstract noun ending -ia.
privative (adj.)

late 14c., privatif, "characterized by absence of a quality, characterized by taking away or removal of something," from Latin privativus "denoting privation," in grammar, "negative," from privatus, past participle of privare "to deprive, rob, strip" of anything; "to deliver from" anything" (see private (adj.)).

In grammar, from 1580s as "expressing negation, changing the sense of a word from positive to negative" (as do the prefixes un-, an- (1), in- (1), a- (3), etc.). Related: Privatively.

pteranodon (n.)

extinct flying reptile of the Cretaceous period, 1876 (Marsh), based on pterodactyl with the stem of Greek anodous "toothless," from an- "not, without" (see an- (1)) + odon (genitive odontos) "tooth" (from PIE root *dent- "tooth").

They are remarkable for their large size, some having a spread of wings not less than twenty-five feet. They differ widely from the Pterodactyls of the old world, especially in the absence of teeth, and hence have been placed by the writer in a new order, Pteranodontia, from the typical genus Pteranodon. [O.C. Marsh, "Principal Characters of American Pterodactyls," 1876]

Page 4