The Collaborative International Dictionary of English v.0.48:

Steer \Steer\ (st[=e]r), n. [OE. steer, AS. ste['o]r; akin to D.
   & G. stier a bull, OHG. stior, Icel. stj[=o]rr,
   [thorn]j[=o]rr, Sw. tjur, Dan. tyr, Goth. stiur, Russ. tur',
   Pol. tur, Ir. & Gael. tarbh, W. tarw, L. taurus, Gr. tay^ros,
   Skr. sth[=u]ra strong, stout, AS. stor large, Icel. st[=o]rr,
   OHG. st[=u]ri, stiuri. [root]168. Cf. Stirk, Taurine, a.]
   A young male of the ox kind; especially, a common ox; a
   castrated taurine male from two to four years old. See the
   Note under Ox.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Steer \Steer\, n. [AS. ste['o]r, sti['o]r; akin to D. stuur, G.
   steuer, Icel. st[=y]ri. [root]168. See Steer, v. t.]
   [Written also stere.]
   A rudder or helm. [Obs.] --Chaucer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Steer \Steer\, v. t.
   To castrate; -- said of male calves.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Steer \Steer\, n. [AS. ste['o]ra. See Steer a rudder.]
   A helmsman; a pilot. [Obs.] --Chaucer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Steer \Steer\, v. t. [imp. & p. p. Steered (st[=e]rd); p. pr.
   & vb. n. Steering.] [OE. steeren, steren, AS. sti['e]ran,
   st[=y]ran, ste['o]ran; akin to OFries. stiora, stiura, D.
   sturen, OD. stieren, G. steuern, OHG. stiuren to direct,
   support, G. steuer contribution, tax, Icel. st[=y]ra to
   steer, govern, Sw. styra, Dan. styre, Goth. stiurjan to
   establish, AS. ste['o]r a rudder, a helm, and probably to
   Icel. staurr a pale, stake, Gr. stayro`s, and perhaps
   ultimately to E. stand. [root]168. Cf. Starboard, Stern,
   n.]
   To direct the course of; to guide; to govern; -- applied
   especially to a vessel in the water.
   [1913 Webster]

         That with a staff his feeble steps did steer.
                                                  --Spenser.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Steer \Steer\, v. i.
   1. To direct a vessel in its course; to direct one's course.
      "No helmsman steers." --Tennyson.
      [1913 Webster]

   2. To be directed and governed; to take a direction, or
      course; to obey the helm; as, the boat steers easily.
      [1913 Webster]

            Where the wind
            Veers oft, as oft [a ship] so steers, and shifts her
            sail.                                 --Milton.
      [1913 Webster]

   3. To conduct one's self; to take or pursue a course of
      action.
      [1913 Webster]

WordNet (r) 3.0 (2006):

steer
    n 1: an indication of potential opportunity; "he got a tip on
         the stock market"; "a good lead for a job" [syn: tip,
         lead, steer, confidential information, wind,
         hint]
    2: castrated bull [syn: bullock, steer]
    v 1: direct the course; determine the direction of travelling
         [syn: steer, maneuver, manoeuver, manoeuvre,
         direct, point, head, guide, channelize,
         channelise]
    2: direct (oneself) somewhere; "Steer clear of him"
    3: be a guiding or motivating force or drive; "The teacher
       steered the gifted students towards the more challenging
       courses" [syn: guide, steer]

Moby Thesaurus II by Grady Ward, 1.0:

173 Moby Thesaurus words for "steer":
   Brahman, Indian buffalo, advice, aim, alerting, aurochs, avoid,
   be responsible for, bear, bear for, bear up for, bear up to, beef,
   beef cattle, beeves, billy, billy goat, bison, boar, bossy, bovine,
   bovine animal, break for, bubbly-jock, buck, buffalo, bull,
   bullock, bum steer, calf, carabao, carry on, carry out,
   carry through, cattle, caution, channel, chanticleer,
   chart a course, circumvent, clue, cock, cockerel, cond, conduct,
   conduct to, conn, control, cow, coxswain, critter, cue,
   dairy cattle, dairy cow, dash for, deal with, direct, direct to,
   dispose, dodge, dog, dogie, drake, drive, entire, entire horse,
   escort, gander, go, go for, gobbler, guide, handle, hart,
   have the conn, he-goat, head, heifer, helm, herd, hit for,
   hold a heading, hold the reins, hornless cow, incline,
   keep away from, kine, lay for, lead, lead to, leppy, make for,
   make go, make up to, manage, maneuver, manipulate, maverick,
   milch cow, milcher, milk cow, milker, monition, muley cow,
   muley head, musk-ox, navigate, neat, office, operate, ox, oxen,
   passing word, peacock, perform on, pilot, play, point,
   point out to, point the way, pointer, practice, put right, ram,
   rooster, route, run, run for, sail for, see, see to, set,
   set out for, set right, set straight, shape a course, shepherd,
   show, show the way, shun, stag, stallion, steer clear of,
   steer for, stirk, stot, stud, studhorse, take care of,
   take the helm, tend, tend to go, tip, tip-off, tom, tom turkey,
   tomcat, top cow, top horse, trend, tup, turkey gobbler,
   turkey-cock, turn, verge, warning, wether, whisper, wisent, work,
   yak, yearling, zebu