: Unstable, unsteady, not fixed. In psychology or psychiatry, labile denotes free and uncontrolled moods or behaviors expressing emotions. In biochemistry, labile means easily removable as, for example, a labile hydrogen molecule. In the context of diabetes, labile is a term used when a diabetic person's blood glucose (sugar) level often swings quickly and widely from high to low and from low to high. Also called brittle and unstable diabetes or type I diabetes. Labile comes from the Latin labilis, meaning liable to slip.
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Unstable; unsteady, not fixed; denoting: 1. An adaptability to alteration or modification, i.e., relatively easily changed or rearranged. 2. Certain constituents of serum affected by increases in heat. 3. An electrode that is kept moving over the surface during the passage of an electric current. 4. In psychology or psychiatry, denoting free and uncontrolled mood or behavioral expression of the emotions. 5. Easily removable; e.g., a l. hydrogen atom. [L. labilis, liable to slip, fr. labor, pp. lapsus, to slip]

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la·bile 'lā-.bīl, -bəl adj readily or frequently changing: as
a) readily or continually undergoing chemical, physical, or biological change or breakdown <a \labile antigen>
b) characterized by wide fluctuations (as in blood pressure or glucose tolerance) <\labile hypertension> <\labile diabetes>
c) emotionally unstable
la·bil·i·ty lā-'bil-ət-ē n, pl -ties

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la·bile (laґbəl) (laґbīl) [L. labilis unstable, from labi to glide] 1. gliding; moving from point to point over the surface; unstable; fluctuating. 2. chemically unstable.

Medical dictionary. 2011.

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  • labile — [ labil ] adj. • v. 1457 au sens 2; bas lat. labilis, de labi « glisser, tomber » 1 ♦ (1840) Sc. Qui est sujet à tomber, à changer. Pétales labiles. Gènes labiles. Vitamine labile, peu stable. 2 ♦ Fig. Qui est sujet à faillir, à changer. Mémoire… …   Encyclopédie Universelle

  • Labile — La bile, a. [L. labilis apt to slip, fr. labi to slip.] 1. Liable to slip, err, fall, or apostatize. [Obs.] Cheyne. [1913 Webster] 2. Liable or likely to change. [PJC] 3. (Chem.) Easily decomposed or inactivated when subjected to heat, radiation …   The Collaborative International Dictionary of English

  • labile — / labile/ agg. [dal lat. tardo labĭlis, der. di labi scivolare, cadere, scorrere ]. 1. [che va via facilmente, che sfugge presto: avere ricordi l. ] ▶◀ debole, fragile, vago, [di memoria] corto. ◀▶ d acciaio, di ferro, forte, [di ricordi]… …   Enciclopedia Italiana

  • labile — LABILE. adj. de tout genre. Il n a d usage qu avec le mot de Memoire, & alors il signifie, Une memoire peu heureuse, peu fidelle, & qui manque souvent au besoin. Il a la memoire fort labile …   Dictionnaire de l'Académie française

  • labile — [lā′bəl, lā′bīl΄] adj. [L labilis < labi, to slip, fall: see LAP1] liable to change; unstable [labile chemical compounds] lability [lā bil′i tē] n …   English World dictionary

  • labile — là·bi·le agg. CO 1a. che scompare rapidamente: tracce labili; che dura poco, passeggero, fugace Sinonimi: caduco, effimero, fugace, transitorio. Contrari: duraturo, durevole. 1b. estens., della memoria, incapace di ritenere i ricordi, debole… …   Dizionario italiano

  • LABILE — adj. des deux genres Caduc, sujet à manquer. Il n est guère usité que dans cette expression, Mémoire labile, Mémoire faible qui manque souvent au besoin. Il a la mémoire labile …   Dictionnaire de l'Academie Francaise, 7eme edition (1835)

  • labile — adjective a) Liable to slip, err, fall, or apostatize. Certain drugs can be conjugated to polymer molecules with a linkage that is labile at low pH to effect controlled release in a cellular endosome. b) Apt or likely to change …   Wiktionary

  • labile — (la bi l ) adj. 1°   Sujet à glisser, à tomber, manquer.    Mémoire labile, mémoire faible qui manque souvent au besoin. •   Elles [de mauvaises poésies] se répandaient dans des oreilles populaires, et n étaient reçues que dans des mémoires… …   Dictionnaire de la Langue Française d'Émile Littré

  • labile — adjective Etymology: French, from Middle French, prone to err, from Late Latin labilis, from Latin labi to slip more at sleep Date: 1603 1. readily or continually undergoing chemical, physical, or biological change or breakdown ; unstable < a… …   New Collegiate Dictionary

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