Relating to or having the characteristics of a bridge with two spans or arches.
From bipont + -ine (Latin suffix meaning 'of or relating to'). This is a very rare scholarly adjective formed from the rare noun bipont.
This word is so obscure that it's rarely used outside of specialized architectural or historical texts—it shows how English has the capacity to create incredibly specific technical terms even when nobody actually needs to say 'relating to two-span bridges' very often.
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