The form soole is a cross reference to the following entry:
The sense of 'sole of foot' and 'flatfish' were split into separate entries in AND1. As both senses derive from the same etymon, the entries have been joined together.
MED entry sil(le n. ('beam') includes a variant sulle so the citation from TLL may represent a Middle English gloss. However, the sense in Middle English does not seem to refer to ceiling rafters.
[hp]