Osteoporosis
Osteoporosis is a long word... so just breaks it down to:
Os teo poro sis
Then, join four chunks into two parts:
Osteo + porosis
Memory work is eased by having less than 5 letters in one chunk.
Understanding the meaning is also make easy this way:
Osteo- (prefix): Combining form meaning bone. From the Greek "osteon", bone.