A fun word

lacuna |ləˈk(y)oōnə|

noun ( pl. -nae |-nī; -nē| or -nas )

an unfilled space or interval; a gap : the journal has filled a lacuna in Middle Eastern studies.

• a missing portion in a book or manuscript.

• Anatomy a cavity or depression, esp. in bone.

DERIVATIVES

lacunal |ləˈk(y)oōnl| adjective

lacunary |ˈlakyəˌnerē; ləˈk(y)oōnərē| adjective

lacunate |-ˌnāt; -nit; ˈlakyəˌnāt| adjective

lacunose |ˈlakyəˌnōs; -ˌnōz| adjective

ORIGIN mid 17th cent.: from Latin, ‘pool,’ from lacus ‘lake.’