| 单词 | preformed |
| 释义 | preformed, ppl. a.
(ˈpriːˌfɔːmd, poet. priːˈfɔːmɪd)
[f. preform + -ed1, or f. pre- A. 1 + formed.]
a. Formed beforehand, previously formed.
1601Shakes. Jul. C. i. iii. 67 The true cause,..Why all these things change from their Ordinance, Their Natures, and pre-formed Faculties, To monstrous qualitie. 1866Odling Anim. Chem. 136 Alloxan, a pre-formed constituent of urine. 1869E. A. Parkes Pract. Hygiene (ed. 3) 217 During baking a certain amount of preformed sugar yields carbonic acid. 1889Mivart Origin Hum. Reason 116 Men do not invent concepts for preformed words, but the reverse.
b. spec. of plastic or other moulding material (cf. preform v.).
1918H. Abraham Asphalts xxvi. 453 (heading) Preformed joints and washers. 1935C. Ellis Chem. Synthetic Resins II. lxviii. 1319 The charge may be used in any of three forms, powder, preformed tablets or sheets. 1943D. W. Brown Handbk. Engin. Plastics i. 9 In some cases..the shape of the article renders it impossible to use preformed materials. 1971E. W. Duck Plastics & Rubbers iv. 60 A pre-formed sheet of the plastic is heated and then brought on to the surface of the mould and drawn tight..by the application of a vacuum. 1977Gramophone June 122/1 The enclosure is very substantially made.., being braced..and filled with pre-formed foam fittings. |
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