• (a.) Shining in the night. • (a.) Shining in the night.
Noc`ti·lu'cous adjective Shining in the night. 
noctilucous Shining at night, phosphorescent. Other related 'dark; shadow, shade; black' units: lygo-; melan-; nigri-; nycti-; scoto-; skio-; umbra-. Another related 'night' unit: nycti-.