sep·til·lionth 
(sĕp-tĭlyənth)
(sĕp-tĭlyənth)n.
1. The ordinal number matching the number septillion in a series.
2. One of a septillion equal parts.
sep·tillionth adv. & adj.
- Indo-European root: ser-
- Indo-European root: ser-
- Indo-European root: seuə-
- Indo-European root: seuə-
- Indo-European root: skand-
- Indo-European root: skei-
- Indo-European root: skel-
- Indo-European root: skel-
- Indo-European root: sker-
- Indo-European root: sker-
- Indo-European root: sker-
- Indo-European root: (s)keu-
- Indo-European root: skeud-
- Indo-European root: skrībh-
- Indo-European root: sleiə-
- Indo-European root: sleubh-
- Indo-European root: slēb-
- Indo-European root: slēg-
- Indo-European root: smei-
- Indo-European root: (s)mer-
- Indo-European root: (s)mer-
- Indo-European root: sneigwh-
- Indo-European root: (s)neəu-
- Indo-European root: snā-
- Indo-European root: (s)nāu-