Crossword clues for the word: SEROUS The word SEROUS has appeared as an answer to at least 10 crossword clues on different crossword puzzles. Crossword clues for SEROUS Showing 1 to 10 of 10 results Clue(s) Concerning blood components Like an antitoxin Like blood fluid Like one blood product Pertaining to blood fluid Thin and watery like a blood component Thin and watery. Watery grave doesn't have one Watery grave I rejected Watery, as a membrane