heavy

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heavy

1. having a relatively high density
2. (of soil) having a high clay content; cloggy
3. (of an industry) engaged in the large-scale complex manufacture of capital goods or extraction of raw materials
4. cloudy or overcast, esp threatening rain
5. (of an element or compound) being or containing an isotope with greater atomic weight than that of the naturally occurring element
6. Horse racing (of the going on a racecourse) soft and muddy
7. 
a. a villainous role
b. an actor who plays such a part
8. Scot strong bitter beer

… heavy

In R/T (radio telephony) terminology, it means large aircraft in the heavy wake turbulence category (e.g., “Air-India 123 heavy”). The suffix indicates that the aircraft is a large transport, alerting controllers and following aircraft to the possibility of wake turbulence.
References in periodicals archive ?
Dahlias love a moist soil, so for these, a heavyish soil is fine.
Sporting a side parting and a pair of heavyish, half horn-rimmed spectacles did very little for his looks
It'll give an extra metre to your reach and can grab heavyish items, like a book or can of soup, or pick up fiddly things from the floor, like a coin.