† megametern.

Forms: 1700s megametre, 1700s–1800s megameter.

Origin: A borrowing from French. Etymon: French mégamètre.

Etymology: < French mégamètre ( C. F. P. de Charnières Mémoire sur l'observation des longitudes en mer (1767) 6) < méga- mega- comb. form + -mètre -meter comb. form². Compare earlier micrometer n. N.E.D. (1906) gives the pronunciation as (megæ·mĭtəɹ) /mɛˈɡæmɪtə(r)/.

Obsolete. rare.

An instrument for determining longitude from the position of the stars, esp. one which is analogous to the astronomical micrometer but designed for measuring large, rather than small, angular distances. Cf. micrometer n. 1.

ΘΚΠ

the world > relative properties > measurement > measuring instrument > [noun] > for measuring large objects

megameter1768

1768 Ann. Reg. 1767 96/2 To make trial of some instruments, designed to facilitate the determination of the longitude by sea, and particularly..the megametre or grand measurer of the Sieur de Charnieres.

1778 Philos. Trans. 1777 (Royal Soc.) 67 789 An Account of a new Micrometer and Megameter by the Abbé Boscovich, &c. Read June 19, 1777.

a1877 E. H. Knight Pract. Dict. Mech. II. 1419/1 Megameter, an instrument for determining the longitude by observation of the stars.

This entry has been updated (OED Third Edition, June 2001; most recently modified version published online December 2021).

单词	megameter
释义	† megametern. Forms: 1700s megametre, 1700s–1800s megameter. Origin: A borrowing from French. Etymon: French mégamètre. Etymology: < French mégamètre ( C. F. P. de Charnières Mémoire sur l'observation des longitudes en mer (1767) 6) < méga- mega- comb. form + -mètre -meter comb. form². Compare earlier micrometer n. N.E.D. (1906) gives the pronunciation as (megæ·mĭtəɹ) /mɛˈɡæmɪtə(r)/. Obsolete. rare. An instrument for determining longitude from the position of the stars, esp. one which is analogous to the astronomical micrometer but designed for measuring large, rather than small, angular distances. Cf. micrometer n. 1. ΘΚΠ the world > relative properties > measurement > measuring instrument > [noun] > for measuring large objects megameter1768 1768 Ann. Reg. 1767 96/2 To make trial of some instruments, designed to facilitate the determination of the longitude by sea, and particularly..the megametre or grand measurer of the Sieur de Charnieres. 1778 Philos. Trans. 1777 (Royal Soc.) 67 789 An Account of a new Micrometer and Megameter by the Abbé Boscovich, &c. Read June 19, 1777. a1877 E. H. Knight Pract. Dict. Mech. II. 1419/1 Megameter, an instrument for determining the longitude by observation of the stars. This entry has been updated (OED Third Edition, June 2001; most recently modified version published online December 2021). < n.1768
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