concave

A concave mirror would project a real inverted image of the silverpoint onto the panel, which van Eyck would trace.

As a practical example, an astigmation corrected scanning flat holographio concave grating (SFHCG) is designed and some results of the numerical and optical experiments are given.

Utricles convex abaxially, plane or slightly concave adaxially; rostra 1/8-1/5 length of kernel; seed adherent to pericarp; leaves and bracts acute but not acicular at apex.

In contrast to prominent ear with underdeveloped antihelix fold, over-convex-antihelix ear reveals a sharp acute angle of antihelix and over-concaved scapha.

The concave mirror focused the light rays at a single point.

The concave shape of the bowl made it perfect for holding soup.

She used a concave lens to correct her vision.

The artist created a concave effect by carving into the sculpture.

The concave surface of the moon can be seen with a telescope.

The concave side of the spoon is perfect for scooping out ice cream.

The concave shape of the cave provided shelter from the storm.

The concave indentation in the wall was filled with water.

The concave design of the building allowed for natural ventilation.

The concave curve of the road made it difficult to see around the corner.

For them, the mask is concave and rotates in one direction.

Red blood cells are tiny by concave disc-shaped cells known as erythrocytes.

Concave mirrors direct the sun to a middle tube to heat an oil solution.

I would, I'd be going down concave over.

You built that big concave glass tower.

He flapped across the room, chest concave, shoulders rounded, arms hanging limp, feet wide apart, chin thrust forward.

They find a concave branch or  stump and lay their egg there.

There's a concave deformity in the right atrium.

He and his comrade-in-arms worked at a concave concealment.

A concave mirror creates an image from this light using a design pioneered in the 17th century, by Sir Isaac Newton.