The most common and most likely answer to this crossword clue is the 8 letter word DIHEDRAL
I've seen this crossword clue in The Times
D
I
H
E
D
R
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More clues leading to the result DIHEDRAL
Buddy explains!
The straight part
We know that "two-faced" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case two-faced = dihedral.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does DIHEDRAL mean?
DIHEDRAL noun- An angle between two plane surfaces
- The upward slope of an aircraft's wing
- The angle between pairs of chemical bonds separated by a third bond
- Consisting of, relating to or contained between two plane surfaces.
- (of a kite or an aeroplane) Having wings that form a dihedral angle, especially when the angle between the upper sides is less than 180°.
- Of wing pairs, inclined at an upward angle to each other.