The Collaborative International Dictionary of English v.0.48:

Trumpets \Trump"ets\, n. pl. (Bot.)
   A plant (Sarracenia flava) with long, hollow leaves.
   [1913 Webster]

WordNet (r) 3.0 (2006):

trumpets
    n 1: pitcher plant of southeastern United States having erect
         yellow trumpet-shaped pitchers with wide mouths and erect
         lids [syn: huntsman's horn, huntsman's horns, yellow
         trumpet, yellow pitcher plant, trumpets, Sarracenia
         flava]

Easton's 1897 Bible Dictionary:

Trumpets
   were of a great variety of forms, and were made of divers
   materials. Some were made of silver (Num. 10:2), and were used
   only by the priests in announcing the approach of festivals and
   in giving signals of war. Some were also made of rams' horns
   (Josh. 6:8). They were blown at special festivals, and to herald
   the arrival of special seasons (Lev. 23:24; 25:9; 1 Chr. 15:24;
   2 Chr. 29:27; Ps. 81:3; 98:6).

     "Trumpets" are among the symbols used in the Book of
   Revelation (Rev. 1:10; 8:2). (See HORN.)