noun

1. the separable, pointed head or tip of an arrow, made formerly of flint or stone, now usually of metal
2. anything shaped like an arrowhead; specif., an indicating mark, part of a cuneiform character, etc.: the sign (<) as used throughout this dictionary marks the derivation of a word or word form from another
3. any of various marsh plants (genus Sagittaria) of the water plantain family, with arrow-shaped leaves and small, white, open flowers