Answer:

cubits

Answer	Crossword Clue
CUBITS	Biblical units
CUBITS	Ark units
CUBITS	Foot predecessors

CUBITS	Length measures, 18 inches.
CUBITS	Old units of length
CUBITS	Ark measures
CUBITS	Ancient measures

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.