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a part of the amniotic sac that sometimes envelops the head of the fetus at birth.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

great·er o·men·tum

an areolar, four-layer peritoneal fold, formed by the double-layer dorsal mesentery of the stomach (dorsal mesogastrium) descending from the greater curvature of the stomach to fold under on itself and ascend to the transverse colon; the descending and ascending portions fuse, obliterating the inferior recess of the omental bursa, resulting in the four-layer structure that usually hangs over the anterior aspect of the intestines like an apron; components include the following peritoneal ligaments: gastrophrenic, gastrosplenic, splenorenal, and gastrocolic.
Synonym(s): omentum majus [TA], caul (2) , cowl, epiploon, gastrocolic omentum, pileus, velum (3)
Farlex Partner Medical Dictionary © Farlex 2012


n. pl. pi·lei (-lē-ī′)
1. Botany The umbrellalike fruiting structure forming the top of a stalked fleshy fungus, such as a mushroom; the cap.
2. A brimless round skullcap worn by ancient Romans.
3. See caul.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


the cap of a mushroom or toadstool.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
Pilei of the mushrooms in the immature physiological stage had higher values of DM, P, N, and A compared with equivalent pilei in mushrooms at the mature physiological stage.
The results of the whole mushrooms represent intermediate values between the stipes and pilei for all mycochemical characteristics analyzed.
According to Chang and Miles [29], the amount of (1[right arrow]4)-[beta]-glucan in the mushroom can also be associated with the amount of cellulose, with the highest amount being found in the stipes of immature mushrooms (7.29%) and in the immature of whole mushroom (7.21%), which may justify the market of this mushroom with closed pilei.
The scatter plot analysis of the first two principal components showed three major regions (Figure 2, morphological parts), associated with the morphological parts of mushrooms: the left region, which had the lowest value for PC1, was associated with the pilei of the mushrooms; the opposite region, which had the highest value for PC1, was associated with the stipes; and the central region was associated with the whole mushrooms.
In this instance, there was a subdivision of the materials related to the morphological parts, stipes, and pilei, respectively.
From interpretation of the scatter plot, the results suggested that the pilei had a higher content of EV, M, HE, A, N, P, and ADF, compared to the stipes and whole mushrooms.
In our study, we propose that the concentration of some components in specific morphological parts (i.e., pilei) of the mushroom is related to biochemical processes involved in the reproduction of fungi, mainly formation and maturation of the spores (events of karyogamy, meiosis, and sporogenesis).
This methodology is extremely important for the formulation of new nutritional products to be applied in specific diets based on fungal foods, such as diets with high protein and mineral "ash" content (use of pilei) or diets with high carbohydrates and energy value content (use of stipes).
Caption: Figure 1: (a) Mushroom in different physiological stages (yellow arrow refers to mature mushroom with mature spore "dark brown spores"; red arrow refers to mature mushroom with immature spores; and blue arrow refers to immature mushrooms with closed pilei without lamella break).