/ Dictionary / Index D decimus: Meaning and Definition of Find definitions for: dec•i•mus Pronunciation: (des'u-mus Lat. dek'i-m&oobreves&sec), [key] — adj. (in prescriptions) tenth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. decimeter decinormal Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language