| 释义 |
megascopic, a.|mɛgəˈskɒpɪk|
[Formed as prec. + -ic.]
1. Visible to the naked eye without the aid of a microscope; = macroscopic.
1879Rutley Study Rocks xi. 194 Crystals, both megascopic and microscopic, occur..in some perlites. 1890Billings Nat. Med. Dict., Megascopic, macroscopic.
2. a. Of or pertaining to the megascope or to the projection of images of opaque objects upon a screen. b. Enlarged or magnified, spec. of photographic pictures, images, etc. (Webster 1902).
Also megaˈscopical a.; megaˈscopically adv.
1890in Century Dict. 1894H. S. Washington Volcanoes Kula Basin 21 Megascopically it is much more frequent and prominent than either the augite or the olivine. 1909J. P. Iddings Igneous Rocks I. ii. iii. 445 Coarse-grained rocks..must be measured megascopically on the surface of proper-sized specimens. 1938A. Johannsen Descr. Petrogr. Igneous Rocks IV. 377 Megascopically, laths of black pyroxene up to 2 cm. in length are seen. 1943Amer. Mineralogist XXVIII. 499 The material under the botryoidal surface is also megascopically crystalline. 1970K. C. Jackson Textbk. Lithology iv. 214 Epidote..is difficult to recognize megascopically because of small grain size and masking by associated micaceous minerals. |