| 释义 |
ˈwhite-heart, n. and a.
A. n.
1. In full white-heart cherry (for white heart-cherry; cf. black-heart s.v. black a. 19): A light-coloured variety of cultivated cherry.
1707[see black heart s.v. black a. 19]. 1733W. Ellis Chiltern & Vale Farm. 143 The May-duke, White-hart, Black-Orleance and the Morella. 1869Blackmore Lorna D. xxvi, The blackbirds eating our white-heart cherries.
2. Metallurgy. Malleable cast iron made by keeping white iron at a high temperature for several days in an oxidizing environment, so as to remove the carbon from the surface layers and increase the ductility and strength. Freq. attrib.
1925Jrnl. Iron & Steel Inst. CXII. 433 The material examined consisted of metal from the open-hearth furnace only, corresponding to that used for whiteheart castings and blackheart castings in Europe and America. 1949[see Réaumur b]. 1960[see graphitize v. 1 b]. 1968A. H. Cottrell Introd. Metallurgy xxv. 519 Whiteheart malleable iron is made by heating the casting in an oxidizing environment.
B. adj. Having a white or light-coloured ‘heart’.
1747H. Glasse Art of Cookery iv. 57 Take a fine White-heart Cabbage. 1900Daily Express 25 Apr. 6/4 Fine white-heart lettuces. |