DEFINITION of -a

Forms nouns: condition (of), state (of); As a prefix, a- is a privative (negating) morpheme meaning “without,” “not,” or “lacking” — indicating the absence of a structure, function, or condition. It attaches to Greek-derived roots. When the root begins with a vowel, it typically becomes an- to ease pronunciation. As a suffix, -a serves primarily as a grammatical/nominative ending in Latin and Greek nouns (especially neuter plural Latin forms and feminine singular forms), giving medical terms their standard noun form rather than carrying independent clinical meaning.


ETYMOLOGY of -a

greek a- / an- — the Greek alpha privative, one of the oldest and most productive prefixes in medical terminology. Parallel to Latin in- (also meaning “not/without”). The suffix use derives from Latin and Greek nominative noun endings


RELATED TERMS to -a

-acondition (of)state (of)-
-emaYesYes-
-esisYesYes-
-iaYesYes-
-ismYesYesquality of
-ismusYesYesmuscular spasm
-sisYesYes-
-tyYesYes-
-yYesYes-


Med roots dictionary Appendix A Prefixes Appendix B Combining Forms Appendix C Suffixes Appendix D Suffix forms