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[lahy-sis] /ˈlaɪ sɪs/

noun, plural lyses [lahy-seez] /ˈlaɪ siz/ (Show IPA)
Immunology, Biochemistry. the dissolution or destruction of cells by lysins.
Medicine/Medical. the gradual recession of a disease.
Compare (def 4).
a combining form with the meaning “breaking down, loosening, decomposition,” used in the formation of compound words:
analysis; electrolysis; paralysis.
noun (pl) -ses (-siːz)
the destruction or dissolution of cells by the action of a particular lysin
(med) the gradual reduction in severity of the symptoms of a disease
combining form
indicating a loosening, decomposition, or breaking down: electrolysis, paralysis

“dissolution of cells, bacteria, etc.,” 1902, from Latin lysis, from Greek lysis “a loosening,” from lyein “to unfasten, loose, loosen, untie” (see lose).

scientific/medical word-forming element meaning “loosening, dissolving, dissolution,” from Greek lysis “a loosening, setting free, releasing, dissolution,” from lyein “to unfasten, loose, loosen, untie” (see lose).

lysis ly·sis (lī’sĭs)
n. pl. ly·ses (-sēz)

-lysis suff.
Decomposition; dissolving; disintegration: hydrolysis.
The disintegration of a cell resulting from destruction of its membrane by a chemical substance, especially an antibody or enzyme.


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  • Lysistrata

    [lis-uh-strah-tuh, lahy-sis-truh-tuh] /ˌlɪs əˈstrɑ tə, laɪˈsɪs trə tə/ noun 1. a comedy (411 b.c.) by Aristophanes. Lysistrata [(leye-sis-truh-tuh, lis-uh-strah-tuh)] An ancient Greek comedy by Aristophanes. The title character persuades the women of Athens and Sparta, which are at war, to refuse sexual contact with their husbands until the two cities make peace.

  • Lysithea

    [lahy-sith-ee-uh] /laɪˈsɪθ i ə/ noun, Astronomy. 1. a small moon of the planet Jupiter. /laɪˈsɪθɪə/ noun 1. (astronomy) a small satellite of Jupiter in an intermediate orbit

  • Lyso-

    1. variant of . combining form 1. indicating a dissolving or loosening: lysozyme word-forming element indicating “loosening, dissolving, freeing,” before vowels lys-, from comb. form of Greek lysis “a loosening” (see lyse). lyso- or lys- pref. Lysis: lysin.

  • Lysocline

    [lahy-suh-klahyn] /ˈlaɪ səˌklaɪn/ noun, Oceanography. 1. the depth of the ocean at which the solubility of calcium carbonate increases substantially.

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