13 letters · 20 points in Scrabble
noun an expression in parentheses
adjective qualifying or explaining; placed or as if placed in parentheses
originFrom Medieval Latin parentheticus (from Late Latin parenthesis or Ancient Greek παρένθετος (parénthetos), + -icus) + -al. By surface analysis, par- + en- + thetical.
Etymology from Wiktionary, CC BY-SA 3.0