| 释义 |
crusta|ˈkrʌstə|
Pl. crustæ.
The L. original of crust n., used in some scientific senses and combinations. a. Anat. The ventral part of the cerebral peduncle. b. Path. = crust n. 3. c. crusta fibrosa, c. petrosa, the cement of a tooth (cement n. 4). d. crusta lactea, an eruptive disease of infants at the breast; milk-scab, milk-blotch. e. crusta phlogistica (see quot. 1890).
1806Med. Jrnl. XV. 33 Crusta Lactea..sometimes proves a very severe..disease; in some families attacking every child at the age of a few weeks. 1820R. Hooper Med. Dict. (ed. 4) 266/1 Crusta,..a scab. 1848Dunglison Med. Dict. (ed. 7) 238/2 Crusta phlogistica. Ibid. 851/1 At the part where the enamel terminates at the cervix of the tooth, the crusta pertro'sa, cemen'tum, or cortical substance, commences in an extremely thin stratum. 1856Crusta lactea [see milk-scab s.v. milk n. 10 a]. 1876T. Bryant Pract. Surg. (ed. 2) I. xiii. 537 The crusta petrosa is formed on the gradually elongating root through the agency of the dental sac or capsule which surrounds the forming tooth crown. 1876Quain's Elem. Anat. (ed. 8) II. 555 The lower or superficial part [of the peduncular fibres]..consists almost entirely of white fibres, collected into coarse fasciculi and is named the crusta [earlier edd., crust] or basis, or the fasciculated portion of the peduncle. 1890Billings Med. Dict. I. 353/2 Crusta fibrosa, crusta petrosa... Crusta phlogistica, inflammatory or buffy coat of blood. 1910Encycl. Brit. IV. 395/2 The ventral part of each crus forms the crusta, which is..the great motor path from the brain to the cord. 1911Ibid. XXVI. 501/1 Surrounding the dentine where it is not covered by enamel is the ‘cement’ or ‘crusta petrosa’, a thin layer of bone. 1949F. W. Jones et al. Buchanan's Man. Anat. (ed. 8) v. 266 Cement, or crusta petrosa. This covers the dentine that forms the root of the tooth. Ibid. xiii. 1400 The basis pedunculi (crusta)..has a crescentic outline, the concavity of the crescent being dorsal and occupied by the convexity of the substantia nigra.
f. Antiq. A thin plate of embossed metal, etc., inlaid on a vessel, wall, or other object.
1842Brande Dict. Sci., etc., Crusta, in gem sculpture, a gem engraved for inlaying on a vase or other object. 1910Encycl. Brit. XIV. 627/2 The proscenium of the Odeum was lined with crustae, or ‘marble-veneering’, under one inch thick. 1911Ibid. XXIII. 484/1 The crustae, or plaques decorated in repoussé, which were mounted on smooth silver cups. Ibid., Cups adorned with golden crustae. |