Etymology
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interstice (n.)

early 15c., from Old French interstice (14c.) and directly from Latin interstitium "interval," literally "space between," from inter "between" (see inter-) + stem of stare "to stand" (from PIE root *sta- "to stand, make or be firm"). Related: Interstices.

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interstitial (adj.)
"pertaining to or situated in an interstice," 1640s, from Latin interstitium "interval" (see interstice) + -al (1). Related: Interstitially.
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