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a combining form meaning “heart,” used in the formation of compound words:
cardiogram.
Contemporary Examples

This is a nice way to shake up the routine and will really add an element of cardio the exercise.
Squats: The Absolutely Incredible Secret to Staying in Shape Ari Meisel January 1, 2014

Those carbs need to be burned with cardio, or else weight loss will plateau.
Dispelling the ‘Chronic Cardio’ Myth Jason Fitzgerald April 22, 2014

Some supporters keep pace, and others trail behind walking, there to observe Booker in the flesh more than for the cardio.
The Ugly Truth About Cory Booker, New Jersey’s Golden Boy Olivia Nuzzi October 19, 2014

Their roster also includes Reformer, Power Tower, cardio Chair, and many other Pilates-based classes.
12 Priciest Fitness Classes (Actually Worth the Splurge) DailyBurn February 2, 2014

Tone is their MegaFormer-based class, drawing from Pilates with a strength and cardio twist.
12 Priciest Fitness Classes (Actually Worth the Splurge) DailyBurn February 2, 2014

Lifting Weights Get a cardio workout in while lifting weights!
Five Smarter Ways to Train Your Heart DailyBurn December 8, 2013

Do cardio and strength train simultaneously while engaging every major body part.
The Busy Person’s Guide to Becoming a Fitness Minimalist DailyBurn December 26, 2013

Depending on who you ask, cardio exercise is either the fountain of youth or the ticket to an early grave.
Dispelling the ‘Chronic Cardio’ Myth Jason Fitzgerald April 22, 2014

Head to the grocery store and carry your groceries home for a quick arm workout, or clean your home for cardio boost.
7 FitBit Hacks to Burn More Calories in 2014 Megan Humphreys January 5, 2014

Looking for a rec center with an acre of cardio and weight machines like the ones used at the Beijing Olympics?
The Real College Crisis Isn’t About Student Loan Rates Patricia Murphy July 10, 2013

combining form
heart: cardiogram

before vowels cardi-, word-forming element meaning “pertaining to the heart,” from Latinized form of Greek kardia “heart” (see heart (n.)).

cardio- or cardi-
pref.

Heart: cardiovascular.

Cardia: cardiodiosis.