penicillatePronunciation: /ˈpɛnɪsɪlət, -ˈsɪlət/Definition of penicillate adjective Biology having, forming, or resembling a small tuft or tufts of hair. Origin: early 19th century: from Latin penicillus 'paintbrush' + -ate2penicillate in other Oxford dictionaries Definition of penicillate in the US English dictionary