alabren.
Apparently a transmission error for calabre (see quot. 1362 at calaber n. 1).
ΚΠ
a1450 (a1376) W. Langland Piers Plowman (Rawl.) (1960) A. vii. l. 254 Alabre [c1400 Trin. Cambr. R.3.14 And ek his cloke [of] calabre & þe knoppis of gold].
This entry has been updated (OED Third Edition, September 2012; most recently modified version published online December 2019).
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n.a1450