noun \ˈril\

Definition of RILL

:  a very small brook

Origin of RILL

Dutch ril or Low German rille; akin to Old English rīth rivulet
First Known Use: 1538

Other Geology Terms

anthracite, boulder, cwm, erratic, igneous, intrusive, mesa, sedimentary, silt, swale



Definition of RILL

intransitive verb
:  to flow like a rill

First Known Use of RILL



noun \ˈril\

Definition of RILL

:  any of several long narrow valleys on the moon's surface

Variants of RILL

rill or rille \ˈril, ˈri-lə\

Origin of RILL

German Rille, literally, channel made by a small stream, from Low German, rill
First Known Use: 1868

Other Astronomy Terms

gibbous, nadir, nebulous, penumbra, retrograde, sidereal, syzygy, wane, wax, zenith


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