Definition

1. Adjective:
   • Concave on both sides: Having a surface or shape that curves inward on both sides; doubly concave.

Usage

• This term is primarily used in technical and scientific contexts, particularly in optics, geometry, and lens design, to describe a shape or object that is curved inward on both of its principal surfaces.
• It is a precise descriptor and is not commonly used in everyday conversation.

Examples

• Adjective:
  • A concavo-concave lens is also known as a biconcave lens.
  • The researcher examined the concavo-concave surface of the mirror under a microscope.

Advanced Usage

• Technical Specification: Often used in technical manuals or optical engineering to specify the curvature of lenses or mirrors.
  • The design requires a concavo-concave element to diverge the light beam properly.

Variants and Related Words

• Biconcave (adj): An exact synonym, meaning concave on both sides.
  • Biconcave lenses are used to correct for myopia.
• Concave (adj): Curving inward.
  • The inside of a spoon is a concave surface.
• Convex (adj): Curving outward. (Antonym in the context of a single surface)
• Plano-concave (adj): Flat on one side and concave on the other.
• Convexo-concave (adj): Convex on one side and concave on the other.

Synonyms

• Biconcave: Concave on both sides.
• Double-concave: Concave on both sides.

Antonyms

• Convexo-convex: Convex on both sides (biconvex).
• Plano-convex: Flat on one side, convex on the other.

Adjective

1. concave on both sides