The Collaborative International Dictionary of English v.0.48:

Od \Od\, n. [G., fr. Gr. ? passage.] (Physics)
   An alleged force or natural power, supposed, by Reichenbach
   and others, to produce the phenomena of mesmerism, and to be
   developed by various agencies, as by magnets, heat, light,
   chemical or vital action, etc.; -- called also odyle or the
   odylic force. [Archaic]
   [1913 Webster]

         That od force of German Reichenbach
         Which still, from female finger tips, burnt blue.
                                                  --Mrs.
                                                  Browning.
   [1913 Webster]

WordNet (r) 3.0 (2006):

OD
    n 1: a doctor's degree in optometry [syn: Doctor of Optometry,
         OD]
    2: the right eye [syn: oculus dexter, OD]

Moby Thesaurus II by Grady Ward, 1.0:

139 Moby Thesaurus words for "OD":
   AB, ADC, Ancient Mariner, Argonaut, CO, Dylan, Flying Dutchman,
   Neptune, Poseidon, Varuna, able seaman, able-bodied seaman, aide,
   aide-de-camp, asphyxiate, be brought down, be felled, be killed,
   be struck down, be traumatized, bluejacket, boatswain, break out,
   brigadier, brigadier general, buccaneer, captain, catch,
   catch cold, chicken colonel, chief engineer, chief mate,
   chief of staff, choke, collapse, colonel, come down with,
   commandant, commander, commander in chief, commanding officer,
   commissioned officer, commit hara-kiri, commit suicide,
   company officer, contract, deck officer, deep-sea man, drown,
   erupt, exec, executive officer, fair-weather sailor, famish, fever,
   field marshal, field officer, first lieutenant, fisherman,
   five-star general, four-star general, general, general officer,
   generalissimo, get, go into shock, hearty, jack, jack afloat,
   jack-tar, jacky, jemadar, junior officer, lieutenant,
   lieutenant colonel, lieutenant general, limey, lobsterman, major,
   major general, marechal, mariner, marshal, master, mate, matelot,
   naval officer, navigating officer, navigator, officer,
   one-star general, orderly officer, overdose, patron, pipes, pirate,
   privateer, quartermaster, risaldar, run a temperature,
   sailing master, sailor, salt, sea dog, sea rover, seafarer,
   seafaring man, seaman, second mate, senior officer, shavetail,
   shipman, shipmaster, sicken, sirdar, skipper, smother,
   staff officer, starve, strangle, subahdar, subaltern,
   sublieutenant, suffocate, take, take an overdose, take ill, tar,
   the Old Man, the brass, three-star general, top brass,
   two-star general, viking, watch officer, water dog, whaler,
   windjammer, windsailor



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

OD
       Optical Disk