Answer:

iso

Answer	Crossword Clue
ISO	Bar opener
ISO	Introduction to metrics?
ISO	Late or bar lead-in

ISO	Bar opener?
ISO	Prefix with metric or bar
ISO	Tonic or bar opener
ISO	Metric or bar opener
ISO	Prefix with metric
ISO	Wanted ad letters
ISO	Tonic starter
ISO	Organization

ISO	Kin of equi-
ISO	Metric prefix
ISO	Late start?
ISO	Equi-
ISO	Metric starter
ISO	Equal (prefix)
ISO	Equalizing prefix
ISO	Prefix meaning "equal"

ISO	Looking for, in personals
ISO	Late starter?
ISO	Prefix with metrics
ISO	Prefix with tonic
ISO	Equal: Prefix
ISO	Tonic opener
ISO	Bar intro?
ISO	Metric lead-in

ISO	Thermal opening
ISO	Bar lead-in
ISO	Bar opening?
ISO	Metric header?
ISO	Metric beginning
ISO	Equi- cousin
ISO	Metric opening
ISO	Prefix with bar

ISO	Lead-in for metric
ISO	Prefix with therm
ISO	Equal opening
ISO	Equi- equivalent
ISO	Prefix with propyl

Crossword

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