| Because, what is a circle except a very special ellipse whose foci have joined so close together that they appear to be one. | วิ่งงง! Agora (2009) |
| foci |
| Focillate | v. t. [ L. focilatus, p. p. of focillare. ] To nourish. [ Obs. ] Blount. [ 1913 Webster ] |
| Focillation | n. Comfort; support. [ Obs. ] [ 1913 Webster ] |
| Focimeter | n. [ Focus + -meter. ] (Photog.) An assisting instrument for focusing an object in or before a camera. Knight. [ 1913 Webster ] |
