| 释义 |
‖ bulla|ˈbʊlə, ˈbʌlə|
Pl. bullæ.
[L. = bubble.]
1. Pathol. A vesicle containing watery humour and causing an elevation of the skin.
1876Duhring Dis. Skin 44 Bullæ are irregularly-shaped elevations of the epidermis, varying in size from a split pea to a goose-egg, containing a clear or opaque fluid.
b. Physiol. ‘The tympanic element of the temporal bone, when, as in the dog, it forms a large bubble-like appearance.’ Syd. Soc. Lex.
1872Mivart Elem. Anat. 106 In many Mammals..it forms a large inflated structure termed a bulla. 1881― Cat 62 The posterior surface of the auditory bulla.
2. Zool. A genus of molluscs, with thin and fragile shells, inhabiting deep water.
1847Carpenter Zool. §917 The Bulla and Bullæa..have a small calcareous shell in which the spiral form begins to manifest itself. 1851Mary Roberts Mollusca 201 The fragile shell of the solitary bulla is utterly inadequate to contend with either winds or waves. |