Perfectly or transparently clear crystal -clear
ETYM Greek, to show or shine through; dia through + phainein to show, and in the passive, to shine: cf. French diaphane. Related to Phantom, Diaphane, Diaphanic.
So thin as to transmit light; SYN. filmy, gauzy, gossamer, see-through, sheer, transparent, vaporous, cobwebby.
Transparent; filmy; translucent.
ETYM Latin lucidus, from lux, lucis, light. Related to Light.
Having a clear mind.
ETYM Latin pellucidus; per (see Per-) + lucidus clear, bright: cf. French pellucide.
1. Clear in meaning: easy to understand or clear in meaning (formal).
2. Transparent: allowing all or most light to pass through (literary).
3. Completely clear; transparent.
4. Clear; transparent. pellucidity.
ETYM Latin translucens, -entis, p. pr. of translucere to shine through; trans across, through = lucere to shine. Related to Lucid.
Shining through; permitting the passage of light but not transparent.
Almost transparent; allowing light to pass through diffusely; SYN. semitransparent.
ETYM French, from Late Lat. transparens, -entis, p. pr. of transparere to be transparent; Latin trans across, through + parere to appear. Related to Appear.
Easily understood or seen through (because of a lack of subtlety).