1. Having little or no perceptible weight; so light as to resemble air.
2. Not practical or realizable; speculative; SYN. impractical, visionary.
3. Open to or abounding in fresh air; SYN. airy.
4. Characterized by lightness and insubstantiality; as impalpable or intangible as air
dioptric / daɪɑːptrɪk /
ETYM Greek, belonging to the use of the eye; dia through + the root of ops eye: cf. French dioptrique.
Of or pertaining to dioptrics or to the refraction of light.
ETYM Latin limpidus; akin to Greek lampein to shine: cf. French limpide. Related to Lamp.
(Of language) Transparently clear; easily understandable; SYN. lucid, luculent, pellucid, crystal clear, perspicuous.
Clear; transparent; pellucid.
pellucid / peluːsɪd /
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.
sheer / ʃɪr /
ETYM Old Eng. shere, skere, pure, bright.
1. Bright; clear; pure; unmixed.
2. Very thin or transparent; -- applied to fabrics.
3. Being thoroughly what it seems to be; mere; downright.
4. Straight up and down; vertical; perpendicular.
transparent / trænsperənt /
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).