Definition of hacek:
(n) :
A surname.
(n) :
(medicine, often attributively) Haemophilus aphrophilus, Actinobacillus actinomycetemcomitans (the former name of Haemophilus actinomycetemcomitans), Cardiobacterium hominis, Eikenella corrodens, Kingella kingae — five gram-negative bacilli that are typically regarded as fastidious or difficult to culture and which can cause bacterial endocarditis.
(n) :
Alternative spelling of háček. [(orthography and typography) A caron; a diacritical mark (ˇ) usually resembling an inverted circumflex, but in the cases of ď, Ľ, ľ, and ť resembling an apostrophe (’) instead.]