phos·phene 
(fŏsfēn′)
(fŏsfēn′)n.
A sensation of light caused by excitation of the retina by mechanical or electrical means rather than by light, as when the eyeballs are pressed through closed lids.
[French phosphène : Greek phōs, light; see PHOS- + Greek phainein, to cause to appear, to show; see bhā-1 in the Appendix of Indo-European roots.]
- Indo-European root: de-
- Indo-European root: deik-
- Indo-European root: dek-
- Indo-European root: dekm̥
- Indo-European root: deks-
- Indo-European root: del-
- Indo-European root: del-
- Indo-European root: dem-
- Indo-European root: demə-
- Indo-European root: dent-
- Indo-European root: der-
- Indo-European root: derk-
- Indo-European root: deru-
- Indo-European root: deu-
- Indo-European root: deu-
- Indo-European root: deuk-
- Indo-European root: deuə-
- Indo-European root: dhegwh-
- Indo-European root: dheigh-
- Indo-European root: dher-
- Indo-European root: dhers-
- Indo-European root: dheu-
- Indo-European root: dheu-
- Indo-European root: dheub-
- Indo-European root: dheugh-