† un-i-thorn.

Etymology: Probably an alteration of a reflex of Old English unþearf detriment, damage, hurt, harm ( < un- prefix¹ + tharf n.), with insertion of y- prefix, after formations of Old English origin with a prefixed base (e.g. un-i-limp n., un-i-selth n., etc.), and with loss of the final consonant (compare β forms at tharf v.).Perhaps partly motivated by prosodic considerations. With the stem vowel o compare similar forms of the present stem of tharf v.