Pb

Pb

The symbol for the element lead².

---

[From Latin plumbum, lead.]

---

PB

abbr.

1. paperback

2. passbook

3. presiding bishop

---

Pb Chem lead [New Latin plumbum]

---

Pb

The symbol for lead.

Thesaurus

Noun	1.	Pb - a soft heavy toxic malleable metallic element; bluish white when freshly cut but tarnishes readily to dull grey; "the children were playing with lead soldiers" atomic number 82, lead metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. cerussite, white lead ore - a mineral consisting of lead carbonate that is an important source of lead galena - soft blue-grey mineral; lead sulfide; a major source of lead hard lead - unrefined lead that is hard because of the impurities it contains antimonial lead, hard lead - a lead alloy that contains about 5% antimony pig lead - lead that is cast in pigs
	2.	Pb - a unit of information equal to 1000 terabits or 10^15 bits Pbit, petabit computer memory unit - a unit for measuring computer memory Tbit, terabit, Tb - a unit of information equal to 1000 gigabits or 10^12 (1,000,000,000,000) bits Eb, Ebit, exabit - a unit of information equal to 1000 petabits or 10^18 bits
	3.	PB - a unit of information equal to 1000 terabytes or 10^15 bytes petabyte computer memory unit - a unit for measuring computer memory terabyte, TB - a unit of information equal to 1000 gigabytes or 10^12 (1,000,000,000,000) bytes exabyte, EB - a unit of information equal to 1000 petabytes or 10^18 bytes
	4.	PB - a unit of information equal to 1024 tebibytes or 2^50 bytes pebibyte, PiB, petabyte computer memory unit - a unit for measuring computer memory tebibyte, TiB, terabyte, TB - a unit of information equal to 1024 gibibytes or 2^40 (1,099,511,627,776) bytes EiB, exbibyte, exabyte, EB - a unit of information equal to 1024 pebibytes or 2^60 bytes