This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
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n. A space, especially a small or narrow one, between things or parts: "There is a gleam of luminous gold, where the sinking western sun has found a first direct interstice in the clouds” ( John Fowles).

n. A small opening or space between objects, especially adjacent objects or objects set closely together, as between cords in a rope or components of a multiconductor electrical cable or between atoms in a crystal.

n. An interval of time required by the Roman Catholic Church between the attainment of different degrees of an order.

n. By extension, a small interval of time free to be spent on activities other than one's primary goal.

n. That which intervenes between one thing and another; especially, a space between things closely set, or between the parts which compose a body; a narrow chink; a crack; a crevice; a hole; an interval.

n. An interval of time; specifically (R. C. Ch.), in the plural, the intervals which the canon law requires between the reception of the various degrees of orders.

n. An intervening space; an opening; especially, a small or narrow space between apposed surfaces or things; a gap, chink, slit, crevice, or cranny.

n. In canon law, the interval of time required for promotion from a lower to a higher degree of orders.

n. a small structural space between tissues or parts of an organ

n. small opening between things

opening   

interstitial   

crack    crevice    hole    interval    fissure    chink    slit    cranny    gap   

crevice    chink    cranny    fissure