Definitions for "Arcus "
a harmless opaque, cloudy ring or arc in the corneal periphery, most often seen in aged persons (arcus senilis) but not uncommonly in middle aged and younger persons (arcus juvenalis); due to the deposition of fat granules in the cornea or to hyaline degeneration; may indicate elevated blood cholesterol levels
Hazy, white, ring-shaped fatty deposit in peripheral cornea and clearly separated from limbus; associated with aging.
an arc-shaped whitish deposit sometimes seen in the cornea
Keywords:  menacing, gust, shelf, tattered, dense
(arc) (bow) often called roll or shelf cloud: A dense, horizontal roll with more or less tattered edges, situated on the lower front part of certain clouds and having, when extensive, the appearance of a dark, menacing arc.
a low, horizontal cloud formation associated with the leading edge of the thunderstorm outflow (i.e., the gust front); roll clouds and shelf clouds both are types of arcus clouds
(Often called roll or shelf cloud.) A dense and horizontal roll cloud or wedge-shaped accessory cloud, sometimes appearing ragged and turbulent and other times smooth, occasionally with multiple layers. It is seen most often in association with cumulonimbus clouds on the leading edge of a gust front. When extensive and approaching, it gives the appearance of a menacing arch. It may also occur with fronts in the absence of a cumulonimbus or in the absence of any thermal boundary. See morning glory.
Arctic Research Consortium of the United States
Arctic Research Consortium of the USA
Latin an arch, Latin arcuatum = curved or arched.
(pl. arcus, adj. arcuate) ( Erdtman, 1947) A locally thickened band of sexine that extends in a sweeping curve from one aperture to another. Example: Alnus (Betulaceae).
Arcus is a Rubik's Cube Simulator featuring 3D display and cube manipulation. Besides conventional solving, getting from any pattern to any goal pattern is supported. Arcus allows the user to bidirectionally walk through the cube's history.