| var. of deca- before a vowel: decathlon. |
| deca- or dec- also deka- or dek- pref. Ten: decane. [Greek deka-, from deka, ten; see dek in Indo-European roots.] |
deca- or dec- or deka- or dek-
pref.
Ten: decane.
| deca-
A prefix that means "ten," as in decahedron, a polygon having ten faces. |