lighttight

lighttight

(ˈlaɪtˌtaɪt)
adj
not permitting the passage of light either in or out
References in periodicals archive ?
In this selection, each SIT starts with a different consonant: BACKPACK, CURLIEWURLIE, DEMISEMI, FUZZYWUZZY, GABBIELABBIE (edd), HOBSONJOBSON, JINGSING (ginseng), KILLERDILLER, LIGHTTIGHT, MUMBOJUMBO, NAMBYPAMBY, PIGGYWIGGY, QARATARA(mountain in Afghanistan), RAGGLETAGGLE, SUPERDUPER, TOSYMOSY, VINETINE st (?
If its leaves are particularly dense, it could be called a lighttight lillypilly, a phrase with 20 tall letters in a row.