libratoryadj.
/ˈlʌɪbrət(ə)ri/, U.S. /ˈlaɪbrəˌtɔri/ Having a motion like that of the beam of a balance; oscillatory.
ΘΚΠ
the world > movement > motion in specific manner > alternating or reciprocating motion > oscillation > [adjective] > about a point of equilibrium
librating1666
libratory1668
1668 Philos. Trans. (Royal Soc.) 3 809 That there is a Libratory motion in Comets as well as in the Moon.
1801 Trans. Soc. Arts 19 257 The beam..acquired a libratory motion.
1804 C. B. Brown tr. C. F. de Volney View Soil & Climate U.S.A. 203 Just as the sea experiences a libratory motion, while its interior currents remain undisturbed.
1874 Edinb. Rev. No. 285. 87 The libratory swaying to and fro of the moon.
This entry has not yet been fully updated (first published 1902; most recently modified version published online March 2022).
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adj.1668