from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. large; chief; applied to an extraordinary billow, supposed by some to be every tenth in order.
- n. An extraordinarily large billow.
from the GNU version of the Collaborative International Dictionary of English
- adj. Large; chief; -- applied to an extraordinary billow, supposed by some to be every tenth in order. [R.] Also used substantively.
from The Century Dictionary and Cyclopedia
- In Rom. milit. antiq., an epithet applied to a gate of the Roman camp near which the tenth cohorts of the legions were encamped. The decuman gate was the principal entrance to the camp, and was that furthest from the enemy.
- Large; immense: used especially of waves.
- n. In astrology, one of the ten divisions of the ecliptic.
- n. A large wave.
Latin decumanus of the tenth, and by metonymy, large, from decem ten. (Wiktionary)