translucent ; pellucid .

[transˈlo͞osnt, tranzˈlo͞osnt]

ADJECTIVE
(of a substance) allowing light, but not detailed shapes, to pass through; semitransparent.
"fry until the onions become translucent"
synonyms:
semitransparent · pellucid · diaphanous · colorless · glassy · glasslike · gossamer · clear · crystalline · see-through · limpid · transparent · transpicuous · translucid
antonyms:
opaque

ORIGIN
late 16th century (in the Latin sense): from Latin translucent- ‘shining through’, from the verb translucere, from trans- ‘through’ + lucere ‘to shine’.