The Collaborative International Dictionary of English v.0.48:

Bossy \Boss"y\, a.
   Ornamented with bosses; studded.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Bossy \Bos"sy\, n. [Dim. fr. Prov. E. boss in boss-calf,
   buss-calf, for boose-calf, prop., a calf kept in the stall.
   See 1st Boose.]
   A cow or calf; -- familiarly so called. [U. S.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

bossy
    adj 1: offensively self-assured or given to exercising usually
           unwarranted power; "an autocratic person"; "autocratic
           behavior"; "a bossy way of ordering others around"; "a
           rather aggressive and dominating character"; "managed the
           employees in an aloof magisterial way"; "a swaggering
           peremptory manner" [syn: autocratic, bossy,
           dominating, high-and-mighty, magisterial,
           peremptory]

Moby Thesaurus II by Grady Ward, 1.0:

107 Moby Thesaurus words for "bossy":
   Brahman, Indian buffalo, Partlet, absolute, absolutist,
   absolutistic, arbitrary, aristocratic, arrogant, aurochs,
   authoritarian, authoritative, autocratic, beef, beef cattle,
   beeves, biddy, bison, bitch, bold, bossed, bovine, bovine animal,
   brood mare, buffalo, bull, bullock, calf, carabao, cattle, chased,
   cow, critter, dairy cattle, dairy cow, despotic, dictatorial, doe,
   dogie, domineering, embossed, ewe, ewe lamb, feudal, filly,
   grinding, guinea hen, gyp, heifer, hen, high-handed, hind,
   hornless cow, imperative, imperial, imperious, in relief, jenny,
   kine, leppy, lioness, lordly, magisterial, magistral, mare,
   masterful, maverick, milch cow, milcher, milk cow, milker,
   monocratic, muley cow, muley head, musk-ox, nanny, nanny goat,
   neat, oppressive, overbearing, overruling, ox, oxen, peahen,
   peremptory, raised, repressive, roe, severe, she-bear, she-goat,
   she-lion, slut, sow, steer, stirk, stot, strict, suppressive,
   tigress, tyrannical, tyrannous, vixen, wisent, yak, yearling,
   zebu