'antihaemophilic' originates from Greek and New Latin elements: specifically 'anti-' (Greek) and 'haima' + '-philos' (Greek), where 'anti-' meant 'against', 'haima' meant 'blood' and 'philos' meant 'loving' or 'having an affinity for'.

'antihaemophilic' was formed in medical New Latin by prefixing 'anti-' to 'haemophilic' (itself from Greek roots), and entered English as the adjective 'antihaemophilic' to denote agents opposed to haemophilia.

Initially the component parts meant 'against' + 'blood-loving' (in isolation), but the combined medical formation came to mean 'acting against haemophilia' and is used for treatments or factors that counteract the bleeding disorder.