Teenty
Origin
Perhaps from Old English hund-téontiᵹ (compare hund-seofontiᵹ, hund-eahtatiᵹ, hund-niᵹontiᵹ, hund-endleofantiᵹ, and hund-twelftiᵹ for modern seventy, eighty, ninety, and nonstandard eleventy, twelfty, reflecting the old Germanic hybrid base-ten and base-twelve numbering system); perhaps reconstructed based on eleventy etc. and -teen.
Numeral
teenty- (nonstandard) One hundred (100), especially a short hundred when considering long hundreds.
- Base 120 is the largest of the historically attested bases ... There are references to a long or twelftywise count vs a short or teenty-wise count in all of the early Germanic writings.