draining /ˈdɹeɪnɪŋ/noun 3adjective 2forms 3 noun3 •The process by which something is drained or emptied. •[usually plural] The liquid drained from something. •The practice of exploring drains, tunnels, or sewers. adjective2 •Designed and/or used for drainage.The author of this experiment has constructed, and uses a draining wheel of cast iron, that weighs about 4 cwt . — 1834 •Causing a depletion of energy or resources; exhausting.I was very tired; working everyday and then staying at the hospital was very draining. — 2010 formsdrainings · more draining · most draining