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 (sĭ-rō′sə, -zə)
n. pl. se·ro·sas or se·ro·sae (-sē, -zē)
1. A serous membrane, especially one that lines the pericardial, pleural, and peritoneal cavities, enclosing their contents.
2. A membrane that surrounds the embryo of birds, reptiles, and many insects.

[New Latin serōsa, feminine of serōsus, serous, from Latin serum, serum.]

se·ro′sal (-zəl) adj.


1. (Anatomy) another name for serous membrane
2. (Zoology) one of the thin membranes surrounding the embryo in an insect's egg
[C19: from New Latin, from serōsus relating to serum]


(sɪˈroʊ sə, -zə)

n., pl. -sas, -sae (-sē, -zē).
1. the chorion, esp. of birds and reptiles.
[1885–90; < New Latin serōsa, feminine of serōsus < Latin ser(um)]
se•ro′sal, adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.serosa - a thin membrane lining the closed cavities of the body; has two layers with a space between that is filled with serous fluid
pleura - the thin serous membrane around the lungs and inner walls of the chest
tissue layer, membrane - a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants
peritoneum - a transparent membrane that lines the abdominal cavity in mammals and covers most of the viscera
endocardium - the membrane that lines the cavities of the heart and forms part of the heart valves
pericardium - a serous membrane with two layers that surrounds the heart
epicardium, visceral pericardium - the innermost of the two layers of the pericardium
parietal pericardium - the tough outermost layer of the pericardium that is attached to the diaphragm and the sternum
References in periodicals archive ?
Tunica serosa consisted of connective tissue, nerves, blood vessels and mesothelium (Rocha and Lima, 1998).
Organs such as those found in the digestive tract have four tunics: tunica mucosa, tela submucosa, tunica muscularis, and tunica adventitia or tunica serosa (Figure 3-12).
The basic characteristics of the genital ducts are similar to other tubular organs; that is, the parenchyma consists of concentric layers of tissue: tunica serosa (or tunica adventitia), tunica muscularis, tela submucosa, and mucosa.