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barcode

(Encyclopedia)CE5 Barcode barcode, computer coding system that uses a printed pattern of lines and bars to identify such things as products, mail and packages, and customer accounts; the term also is used for s...

kidneys

(Encyclopedia)kidneys: see urinary system.

ganglion

(Encyclopedia)ganglion: see nervous system.

epicycle

(Encyclopedia)epicycle: see Ptolemaic system.

penis

(Encyclopedia)penis: see reproductive system.

reflex

(Encyclopedia)reflex: see nervous system.

peristalsis

(Encyclopedia)peristalsis: see digestive system. ...

nephron

(Encyclopedia)nephron: see urinary system.

nerve

(Encyclopedia)nerve: see nervous system.

villi

(Encyclopedia)villi: see digestive system.