The Collaborative International Dictionary of English v.0.48:

Spanish \Span"ish\, a.
   Of or pertaining to Spain or the Spaniards.
   [1913 Webster]

   Spanish bayonet (Bot.), a liliaceous plant (Yucca
      alorifolia) with rigid spine-tipped leaves. The name is
      also applied to other similar plants of the Southwestern
      United States and mexico. Called also Spanish daggers.


   Spanish bean (Bot.) See the Note under Bean.

   Spanish black, a black pigment obtained by charring cork.
      --Ure.

   Spanish broom (Bot.), a leguminous shrub (Spartium
      junceum) having many green flexible rushlike twigs.

   Spanish brown, a species of earth used in painting, having
      a dark reddish brown color, due to the presence of
      sesquioxide of iron.

   Spanish buckeye (Bot.), a small tree (Ungnadia speciosa)
      of Texas, New Mexico, etc., related to the buckeye, but
      having pinnate leaves and a three-seeded fruit.

   Spanish burton (Naut.), a purchase composed of two single
      blocks. A

   double Spanish burton has one double and two single blocks.
      --Luce (Textbook of Seamanship).

   Spanish chalk (Min.), a kind of steatite; -- so called
      because obtained from Aragon in Spain.

   Spanish cress (Bot.), a cruciferous plant (Lepidium
      Cadamines), a species of peppergrass.

   Spanish curlew (Zool.), the long-billed curlew. [U.S.]

   Spanish daggers (Bot.) See Spanish bayonet.

   Spanish elm (Bot.), a large West Indian tree (Cordia
      Gerascanthus) furnishing hard and useful timber.

   Spanish feretto, a rich reddish brown pigment obtained by
      calcining copper and sulphur together in closed crucibles.


   Spanish flag (Zool.), the California rockfish
      (Sebastichthys rubrivinctus). It is conspicuously
      colored with bands of red and white.

   Spanish fly (Zool.), a brilliant green beetle, common in
      the south of Europe, used for raising blisters. See
      Blister beetle under Blister, and Cantharis.

   Spanish fox (Naut.), a yarn twisted against its lay.

   Spanish grass. (Bot.) See Esparto.

   Spanish juice (Bot.), licorice.

   Spanish leather. See Cordwain.

   Spanish mackerel. (Zool.)
   (a) A species of mackerel (Scomber colias) found both in
       Europe and America. In America called chub mackerel,
       big-eyed mackerel, and bull mackerel.
   (b) In the United States, a handsome mackerel having bright
       yellow round spots (Scomberomorus maculatus), highly
       esteemed as a food fish. The name is sometimes
       erroneously applied to other species. See Illust. under
       Mackerel.

   Spanish main, the name formerly given to the southern
      portion of the Caribbean Sea, together with the contiguous
      coast, embracing the route traversed by Spanish treasure
      ships from the New to the Old World.

   Spanish moss. (Bot.) See Tillandsia (and note at that
      entry).

   Spanish needles (Bot.), a composite weed (Bidens
      bipinnata) having achenia armed with needlelike awns.

   Spanish nut (Bot.), a bulbous plant (Iris Sisyrinchium)
      of the south of Europe.

   Spanish potato (Bot.), the sweet potato. See under
      Potato.

   Spanish red, an ocherous red pigment resembling Venetian
      red, but slightly yellower and warmer. --Fairholt.

   Spanish reef (Naut.), a knot tied in the head of a
      jib-headed sail.

   Spanish sheep (Zool.), a merino.

   Spanish white, an impalpable powder prepared from chalk by
      pulverizing and repeated washings, -- used as a white
      pigment.

   Spanish windlass (Naut.), a wooden roller, with a rope
      wound about it, into which a marline spike is thrust to
      serve as a lever.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Spanish mackerel
    n 1: flesh of commercially important fishes especially of the
         Atlantic coastal waters of America
    2: any of several large marine food fishes of the genus
       Scomberomorus
    3: medium-sized mackerel of temperate Atlantic and Gulf of
       Mexico [syn: Spanish mackerel, Scomber colias]
    4: a California food fish [syn: horse mackerel, jack
       mackerel, Spanish mackerel, saurel, Trachurus
       symmetricus]