12 letters · 15 points in Scrabble
noun (embryology) the repeated division of a fertilised ovum
noun the act of dividing or partitioning; separation by the creation of a boundary that divides or keeps apart
originEtymology tree English segment Proto-Indo-European *-tis Proto-Indo-European *-Hō Proto-Indo-European *-tiHō Proto-Italic *-tiō Latin -tiō Latin -ātiōlbor. Old French -ationbor. Middle English -acioun English -ation English segmentation From segment + -ation.
Etymology from Wiktionary, CC BY-SA 3.0