arcus

1. A low, horizontal cloud typically forming at the leading edge of thunderstorm outflow.

2. A white band of cholesterol that forms at the edge of the cornea.

3. An arc-shaped band of thickened sexine extending between two apertures on a pollen grain or spore.

4. An elastic band around the base of the arolium, a pad at the end of the leg of certain insects.

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Here are some other words you could make with the letters arcus, you can also
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Top Words by points	Points	Word Game
scaur	7	Scrabble

2 Letters	Scrabble® Points
as	2
ar	2
us	2

3 Letters	Scrabble® Points
arc	5
ars	3
car	5
cru	5
cur	5
sau	3
ras	3
sac	5

4 Letters	Scrabble® Points
ursa	4
sura	4
scar	6
curs	6
crus	6
cars	6
arcs	6

5 Letters	Scrabble® Points
scaur	7
arcus	7