Answer:

alkyl

Answer	Crossword Clue
ALKYL	Ethyl or propyl
ALKYL	Type of hydrocarbon group
ALKYL	Hydrocarbon group

ALKYL	... halide
ALKYL	Chemist's term.
ALKYL	Ethyl or methyl
ALKYL	Word with group or halide
ALKYL	Certain hydrocarbon
ALKYL	Certain free radical
ALKYL	Type of hydrocarbon radical
ALKYL	Chemical radical

Crossword

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