haemalPronunciation: /ˈhiːm(ə)l/ (US hemal)Definition of haemal adjective Physiology of or concerning the blood. Zoology situated on the same side of the body as the heart and major blood vessels (i.e. in chordates, ventral). Origin: mid 19th century: from Greek haima 'blood' + -alhaemal in other Oxford dictionaries Definition of haemal in the US English dictionary