half-open

From half- + open .

half-open (not comparable )

1. partially open; ajar
   • 1964 April, G. Freeman Allen, "The BRB shows traders the Liner train prototypes", in Modern Railways, page 265:

     Between the fixed, full-height ends run flexible covers, carried on tubes running in guides, which can be locked in the closed, half-open or fully open positions; [...].

2. (mathematics ) (referring to an interval on the real line) containing only one of its endpoints

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