The difference between Diaphanous and Opaque

When used as adjectives, diaphanous means transparent or translucent, whereas opaque means neither reflecting nor emitting light.

Opaque is also noun with the meaning: an area of darkness.

Opaque is also verb with the meaning: to make, render (more) opaque.

check bellow for the other definitions of Diaphanous and Opaque

Diaphanous as an adjective:

Transparent or translucent; allowing light to pass through; capable of being seen through.
Diaphanous as an adjective:

Of a fine, almost transparent, texture; gossamer; light and insubstantial.
Diaphanous as an adjective (physics):

Isorefractive, having an identical refractive index.

Opaque as an adjective:

Neither reflecting nor emitting light.
Opaque as an adjective:

Allowing little light to pass through, not translucent or transparent.
Opaque as an adjective (figuratively):

Unclear, unintelligible, hard to get or explain the meaning of
Opaque as an adjective (figuratively):

Obtuse, stupid.
Opaque as an adjective (computing):

Describes a type for which higher-level callers have no knowledge of data values or their representations; all operations are carried out by the type's defined abstract operators.

Opaque as a noun (obsolete, poetic):

An area of darkness; a place or region with no light.
Opaque as a noun:

Something which is opaque rather than translucent.