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Lemonnier, Pierre Charles

(Encyclopedia)Lemonnier, Pierre Charles pyĕr shärl ləmônyāˈ [key], 1715–99, French astronomer. For many years he was professor of physics at the Collège de France. He studied the moon and the influence of ...

Oudry, Jean Baptiste

(Encyclopedia)Oudry, Jean Baptiste zhäN bätēstˈ o͞odrēˈ [key], 1686–1755, French animal painter. A pupil of Largillière, he became court painter to Louis XV, recording the king's hunts in his paintings an...

Campan, Jeanne Louise Henriette

(Encyclopedia)Campan, Jeanne Louise Henriette zhän lwēz äNrēĕtˈ käNpäNˈ [key], 1752–1822, French educator and author. She served as a reader to Louis XV's daughters and as lady-in-waiting to Marie Antoin...

Mississippian period

(Encyclopedia)Mississippian period: see Carboniferous period. ...

Mesolithic period

(Encyclopedia)Mesolithic period mĕzˌəlĭthˈĭk [key] or Middle Stone Age, period in human development between the end of the Paleolithic period and the beginning of the Neolithic period. It began with the end o...

Jurassic period

(Encyclopedia)Jurassic period jərăsˈĭk [key] [from the Jura Mts.], second period of the Mesozoic era of geologic time, lasting from 213 to 144 million years ago. At the start of the Jurassic most of the contine...

Devonian period

(Encyclopedia)Devonian period dĭvōˈnēən [key], fourth period of the Paleozoic era of geologic time between 408 and 360 million years ago (see Geologic Timescale, tablegeologic timescale, table). It was named (...

Cretaceous period

(Encyclopedia)Cretaceous period krĭtāˈshəs [key], third and last period of the Mesozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table), lasting from approximately 144 to 65 millio...

sidereal period

(Encyclopedia)sidereal period, in astronomy, length of time a body takes to complete an orbit relative to the fixed stars. See sidereal time. ...

Silurian period

(Encyclopedia)Silurian period sĭlo͝orˈēən, sī– [key] [from the Silures, ancient tribe of S Wales, where the period was first studied; named by the British geologist R. I. Murchison], third period of the Pal...