| secobarbital | (noun) barbiturate that is a white odorless slightly bitter powder (trade name Seconal) used as a sodium salt for sedation and to treat convulsions | Synonyms: red devil, secobarbital sodium, Seconal |
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| second | (adjective) a part or voice or instrument or orchestra section lower in pitch than or subordinate to the first | - |
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| (adjective) coming next after the first in position in space or time or degree or magnitude | Synonyms: 2d, 2nd |
| (noun) the fielding position of the player on a baseball team who is stationed near the second of the bases in the infield | Synonyms: second base |
| (noun) the gear that has the second lowest forward gear ratio in the gear box of a motor vehicle | Synonyms: second gear |
| (noun) merchandise that has imperfections; usually sold at a reduced price without the brand name | Synonyms: irregular |
| (noun) a speech seconding a motion | Synonyms: endorsement, indorsement, secondment |
| (noun) the official attendant of a contestant in a duel or boxing match | - |
| (noun) a 60th part of a minute of arc | Synonyms: arcsecond |
| (noun) following the first in an ordering or series | - |
| (noun) 1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites | Synonyms: s, sec |
| (noun) an indefinitely short time | Synonyms: bit, minute, mo, moment |
| (noun) a particular point in time | Synonyms: instant, minute, moment |
| (adverb) in the second place | Synonyms: secondly |
| (verb) give support or one's approval to | Synonyms: back, endorse, indorse |
| (verb) transfer an employee to a different, temporary assignment | - |
| secondarily | (adverb) of secondary import | - |
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| secondary | (adjective) being of second rank or importance or value; not direct or immediate | - |
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| (adjective) depending on or incidental to what is original or primary | - |
| (adjective) inferior in rank or status | Synonyms: junior-grade, lower-ranking, lowly, petty, subaltern |
| (adjective) not of major importance | - |
| (adjective) belonging to a lower class or rank | - |
| (noun) coil such that current is induced in it by passing a current through the primary coil | Synonyms: secondary coil, secondary winding |
| (noun) the defensive football players who line up behind the linemen | - |
| seconder | (noun) someone who endorses a motion or petition as a necessary preliminary to a discussion or vote | - |
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| secondhand | (adjective) previously used or owned by another | Synonyms: used |
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| (adjective) derived from what is primary or original; not firsthand | - |
| (adverb) by indirect means | - |
| secondly | (adverb) in the second place | Synonyms: second |
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| secondment | (noun) the detachment of a person from their regular organization for temporary assignment elsewhere | - |
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| (noun) a speech seconding a motion | Synonyms: endorsement, indorsement, second |
| secondo | (noun) the second or lower part of a duet (especially a piano duet) | - |
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