Scientists try to create terminology that's precise and easy to understand by developing it systematically. That is, they create new words by putting together existing and known elements. They use certain syllables or word fragments over and over to build new terms.
You'll soon start to recognize some of these fragments. Then you can put the meanings of different fragments together and accurately guess the meaning of a term you've never seen before, just as you can understand a sentence you've never read before. This table gets you started, listing some word fragments related to the organ systems.
| Body System | Root or Word Fragment | Meaning |
| Skeletal system | os-, oste-; arth- | bone; joint |
| Muscular system | myo-, sarco- | muscle, striated muscle |
| Integument | derm- | skin |
| Nervous system | neur- | nerve |
| Endocrine system | aden-, estr- | gland, steroid |
| Cardiovascular system | card-, angi-, hema-, vaso- | heart (muscle), vessel, blood vessels |
| Respiratory system | pulmon-, bronch- | lung, windpipe |
| Digestive system | gastr-, enter-, dent-, hepat- | stomach, intestine, teeth, liver |
| Urinary system | ren-, neph-; ur- | kidney; urinary |
| Lymphatic system | lymph-, leuk-, -itis | lymph, white, inflammation |
| Reproductive system | andr-, uter- | male, uterine |
Not so long ago, for example, no one speaking plain English used the term laptop to refer to a computer or hybrid to talk about a car. It's possible that, not many years from now, almost no one will understand what people mean by those words.
Scientists, however, require consistency and preciseness to describe the things they talk about in a scientific context. The relative vagueness and changeability of terms in plain English makes this impossible. In contrast, Greek and Latin stopped changing centuries ago: ilio, hypo, and gastro have the same meaning now as they did 200 years ago.
Every time you come across an anatomical or physiological term that's new to you, see if you recognize any parts of it. Using this knowledge, go as far as you can in guessing the meaning of the whole term.