Protective Tissue at the Back of the Nasal Sinus

This page is the CodyCross answer for the clue below from Working From Home, Group 1231, Puzzle 5 (Adequate Lighting).

Question is: Protective Tissue at the Back of the Nasal Sinus

and the answer is: ADENOID

Word Meaning:

ADENOID — Of or relating to lymphatic glands or lymphoid tissue.

Definitions from Wiktionary.