Comparative form of strait: more strait(adjective)
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Use "straiter" in a sentence
"I fancy if she ever lets you into her inner case, you would only find just what has been tormenting and dragging your own life out of you - the same sort of things - only 'her great dragon underground, in straiter fetters bound,' had not been let loose for a long time."
"Wherefore the lexicographer adviseth a striving toward the straiter resemblance of the Average Man than he hath to himself."
"And in such condition my course continued down the channel which now grew wide and then straiter till, sore aweary by reason of the darkness which could be felt, I fell asleep, as I lay prone on the raft, and"