Measure of Alcoholic Spirits, About 1.5 Fl Oz
Puzzle 5 of Celtic Mythology Hard Pack
Question is: Measure of Alcoholic Spirits, About 1.5 Fl Oz
and the answer is: JIGGER
Word Meaning:
JIGGER — (US) A double-ended vessel, generally of stainless steel or other metal, one end of which typically measures 1½ fluid ounces (approx. 44 ml), the other typically 1 fluid ounce (approx. 30 ml).
Definitions from Wiktionary.