ungualPronunciation: /ˈʌŋgw(ə)l/Definition of ungual adjective Zoology & Medicine relating to or affecting a nail, hoof, or claw: the distal ungual phalanges may be much modified to bear claws, nails, or hoofsOrigin: mid 19th century: from Latin unguis 'nail' + -alungual in other Oxford dictionaries Definition of ungual in the US English dictionary