bass

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various North American freshwater fishes of the family Centrarchidae, especially the largemouth bass and the smallmouth bass.
• noun Any of various marine fishes especially of the families Serranidae and Moronidae, and including the sea basses and the striped bass.
• noun A low-pitched sound or tone.
• noun The tones in the lowest register of an instrument.
• noun A male singing voice of the lowest range.
• noun A singer who has such a voice.
• noun An instrument that sounds within this range.
• noun A vocal or instrumental part written within this range.
• noun An instrument, especially a double bass, that produces tones in a low register.
• adjective Having a deep tone.
• adjective Low in pitch.

from The Century Dictionary.

• noun Originally, the perch, but now restricted to fishes more or less like the true perch.
• noun Same as bast.
• noun The American linden or lime-tree, Tilia Americana. See basswood.
• noun A mat made of bass or bast; a bass-mat; hence, any thick mat or matting; formerly, a straw hassock or cushion.
• In music, low; deep; grave.
• noun In music, the lowest part in the harmony of a musical composition, whether vocal or instrumental.
• noun A male voice of the lowest or gravest kind, having a compass of about two octaves from the second F below middle C, or lower.
• noun A singer having such a voice.
• noun A musical instrument of any class having a deep, grave tone, excelled in gravity only by the contrabass.
• noun Same as bass clef (which see, under clef).
• To sing or play the bass part of; accompany with the bass.
• To sound in a deep tone.
• To take the bass part in a concerted piece of music: as, he basses very steadily.
• To kiss.
• noun A kiss; a buss.
• noun The commercial name of a fiber, resembling horsehair or wire, obtained from the sheathing leaf-bases or the leaf-stalks of certain palms. It is dark brown or black in color, and is used for brooms, brushes, ropes, and cables. Also called piassava. See bast-palm, piassava, and bassine.
• noun In coal-mining, black carbonaceous shale.

from the GNU version of the Collaborative International Dictionary of English.

• noun A bass, or deep, sound or tone.
• noun The lowest part in a musical composition.
• noun One who sings, or the instrument which plays, bass.
• noun See Thorough bass.
• noun (Bot.) The linden or lime tree, sometimes wrongly called whitewood; also, its bark, which is used for making mats. See bast.
• noun A hassock or thick mat.
• noun (Zoöl.) An edible, spiny-finned fish, esp. of the genera Roccus, Labrax, and related genera. There are many species.
• noun The two American fresh-water species of black bass (genus Micropterus). See Black bass.
• noun Species of Serranus, the sea bass and rock bass. See Sea bass.
• noun The southern, red, or channel bass (Sciæna ocellata). See Redfish.
• adjective Deep or grave in tone.
• adjective (Mus.) the character placed at the beginning of the staff containing the bass part of a musical composition.
• adjective a deep-sounding voice; a voice fitted for singing bass.
• transitive verb rare To sound in a deep tone.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Of sound, a voice or an instrument, low in pitch or frequency.
• noun A low spectrum of sound tones.
• noun A section of musical group that produces low-pitched sound, lower than tenor.
• noun A male singer who sings in the bass range.
• noun An instrument that plays in the bass range, in particular a double bass, bass guitar, electric bass or bass synthesiser.
• noun The clef sign that indicates that the pitch of the notes is below middle C; a bass clef.