Answer:

prefix

Answer	Crossword Clue
PREFIX	Homo or trans
PREFIX	Part of a word.
PREFIX	Pro- or con-

PREFIX	Attach before
PREFIX	Anti or semi, e.g.
PREFIX	Tri for one
PREFIX	Pre is one
PREFIX	Add beforehand
PREFIX	"Anti" or "semi," e.g.

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.