The Clue
Monopoly's railroads, e.g. (6 letter answer)
The Answer
TETRAD
Tags
Notes
The answer TETRAD is seen occasionally, appearing about once every 850 puzzles.
Related Clues
Fourfold
Foursome
Four of a kind
Group of four
Cat's paws, e.g.
The classical elements, e.g.
Four-note chord
The women in "Little Women," e.g.
Definition
TETRAD as a noun:
1. (four, 4, IV, tetrad, quatern, quaternion, quaternary, quaternity, quartet, quadruplet, foursome, Little Joe) = the cardinal number that is the sum of three and one