Definition of serous in US English:



  • Of, resembling, or producing serum.

    • ‘The presence of small lymphocytes in serous cavity fluid can pose great difficulty in the differentiation between a low-grade lymphoproliferative disorder and reactive lymphocytosis.’
    • ‘There is a disproportionate reduction of serous acini of the submucosal glands, which contain lysozyme, lactoferrin, and an antiprotease of small molecular weight.’
    • ‘The submandibular glands produce a mixture of serous and mucous saliva.’
    • ‘Collection of pooled blood or serous fluid is an additional risk for obese patients.’
    • ‘Liquefied vitreous, serous fluid, or blood may collect in the subretinal space between the sensory retina and the underlying layer of retinal pigment epithelium.’


Late Middle English: from French séreux or medieval Latin serosus, from serum (see serum).