Meanings

rugby

one's repertoire of pitches

leukocytosis

junk ball (pitch)

characteristics of a (thrown) ball (light, heavy, etc.)

extraterrestrial

regulation baseball (as opposed to the variety played with a rubber ball)

softball

steel ball

ball control

Earth Similarity Index

near-Earth asteroid

earth orbit

fried sesame ball

golden staph (Staphylococcus aureus)

table tennis table

school inter-class ball-game competition

ball-and-ring method

badminton

wet-bulb globe temperature