矢状 is read as しじょう (shijou) and means sagittal.
しじょう
shijou
しじょうめん
sagittal plane
しじょうほうごう
sagittal suture
さ
arrow
や
やじるし
arrow (symbol)
やさき
arrowhead
やおもて
in front of a flying arrow (fired by the enemy)
やつぎばや
rapid succession (e.g. questions)
やばおんな
prostitute in a brothel disguised as an archery range
やおもてにたつ
to be in the firing line
やたて
portable brush-and-ink case
やにわ
archery range