Definitions

1. superlative adjective

most fond of or fondly remembering spots, small marks, or small amounts of something

“She thought her grandmother was the dotiest person with a passion for collecting antique stamps.”

2. noun

the most fond or fondly remembering person of spots, small marks, or small amounts of something

“In her obituary, her friends described her as the dotiest person when it came to remembering the smallest details of their lives.”