What is the meaning of -þ?

romanization of -𐌸

alternative form of -th

alternative form of -the (abstract nominal suffix)

forming abstract nouns from verbs, adjectives or other nouns; generally causing mutation of root or preceding vowels

forming abstract nouns from verbs, adjectives or other nouns; generally causing mutation of root or preceding vowels

forming abstract nouns from verbs, adjectives or other nouns; generally causing mutation of root or preceding vowels

Source: wiktionary.org