furcaPronunciation: /ˈfəːkə/Definition of furca noun (plural furcae /-siː, -kiː/) Zoology 1an ingrowth of the thorax of many insects. 2the furcula of a springtail. Derivatives furcal adjective Origin: early 17th century: from Latin, literally 'fork'furca in other Oxford dictionaries Definition of furca in the US English dictionary