de·riv·a·tive /dɪˈrɪvətɪv/
 (a.)引出的,系出的引出之物,系出物,衍生字


 de·riv·a·tive /dɪˈrɪvətɪv/ 形容詞
 衍生,導(函)數,衍生的,衍化物,誘導劑,衍生物


 derivative
 導出 微分 導數


 De·riv·a·tive a.  Obtained by derivation; derived; not radical, original, or fundamental; originating, deduced, or formed from something else; secondary; as, a derivative conveyance; a derivative word.
 Derivative circulation, a modification of the circulation found in some parts of the body, in which the arteries empty directly into the veins without the interposition of capillaries.
 -- De*riv*a*tive*ly, adv. -- De*riv*a*tive*ness, n.


 De·riv·a·tive, n.
 1. That which is derived; anything obtained or deduced from another.
 2. Gram. A word formed from another word, by a prefix or suffix, an internal modification, or some other change; a word which takes its origin from a root.
 3. Mus. A chord, not fundamental, but obtained from another by inversion; or, vice versa, a ground tone or root implied in its harmonics in an actual chord.
 4. Med. An agent which is adapted to produce a derivation (in the medical sense).
 5. Math. A derived function; a function obtained from a given function by a certain algebraic process.
 Note: ☞ Except in the mode of derivation the derivative is the same as the differential coefficient. See Differential coefficient, under Differential.
 6. Chem. A substance so related to another substance by modification or partial substitution as to be regarded as derived from it; thus, the amido compounds are derivatives of ammonia, and the hydrocarbons are derivatives of methane, benzene, etc.

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 derivative
      adj : resulting from or employing derivation; "a derivative
            process"; "a highly derivative prose style"
      n 1: the result of mathematical differentiation; the
           instantaneous change of one quantity relative to
           another; df(x)/dx [syn: derived function, {differential
           coefficient, differential, first derivative]
      2: a financial instrument whose value is based on another
         security [syn: derivative instrument]
      3: (linguistics) a word that is derived from another word;
         "`electricity' is a derivative of `electric'"