| 单词 |
plastid |
| 释义 |
plastid, n. (a.)|ˈplæstɪd|
[a. Ger. plastid (Haeckel), f. Gr. πλαστός (see -plast) + id, after Gr. -ιδιον, dim. suffix.]
1. Biol. An individual mass or unit of protoplasm, as a cell or unicellular organism.
1876E. R. Lankester Adv. Sc. (1890) 283 Haeckel's useful term ‘plastid’ for a corpuscle of protoplasm. 1877Dawson Orig. World 377 If we reduce organized beings to their ultimate organisms—cells or plastids. 1878Bell Gegenbaur's Comp. Anat. p. viii, Our knowledge of the nucleus of organic cells or plastids.
2. Bot. A differentiated corpuscle or granule occurring in the protoplasm of a vegetable cell; e.g. a chlorophyll-granule, a chromoplastid, or a leucoplastid.
1885G. L. Goodale Physiol. Bot. (1892) 287 As the cells which develop from the growing point assume the different characters which fit them for special services..[so] their plastids may likewise assume special characters.
B. adj. Having the character of a plastid.
1890in Cent. Dict. 1895in Syd. Soc. Lex.
Hence ˌplastidogeˈnetic a., producing plastids.
1899Natural Science Dec. 458 The respiratory trees of Holothuroids have four functions—respiratory, hydrostatic, plastidogenetic, and excretory. |
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