canon
This might be just a supplemental entry adding to an entry in the Main Volume.
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
canon
Add: — Béte hé swá canon tǽce, Ll. Th. i. 168, 7. On sumum canone hit cwyð .xii. geár, ii. 230, 5. Hí gesetton ðone canon þæt nán mæssepreóst on his wununge wíf hádes mann næbbe, Hml. Th. i. 97, 29. Canones beódaþ, Hml. S. 36, 387.
This is a supplementary entry with editorial changes to an entry in the main volume of the dictionary. Look under the 'Possibly connected entries' below, or for the same headword in the list to the left.

A Combined List of Abbreviations.

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A Combined List of Abbreviations.