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ox • y • gen / ' aksid3an / noun [ noncount ] ( symbol O )

( CHEMISTRY ) a gas in the air. Animals and plants need oxygen to live.

oys • ter / ' oistsr / noun [ count ]

a small animal with a shell, which lives in the ocean. You can eat some types of oyster , and others produce shiny white things used to make jewelry (called pearls ). —Look at the picture at shellfish .

oz. abbreviation of ounce

o • zone / ' ouzoun / noun [ noncount ]

( CHEMISTRY ) a poisonous gas that is a form of oxygen

o • zone-friend • ly / , ouzoun frendli /

adjective

(used about cleaning products, etc.) not containing chemicals that could harm the ozone layer Most aerosol sprays are now ozone-friendly.

the o • zone lay • er / 6i ' ouzoun ,ieisr / noun

[ singular ]

the layer of ozone high above the surface of the earth, which helps to protect the earth from the bad effects of the sun

P, p / pi / noun [ count, noncount ]

( plural P's, p's / piz / ) the sixteenth letter of the English alphabet

"Pencil" begins with a "P."

p. abbreviation of page

pace 1 / peis / noun

[ singular ] how fast you do something or how fast something happens

We started at a steady pace .

[ count ] a step Take two paces forward.

keep pace with someone or something

to go as fast as someone or something

She couldn't keep pace with the other runners.

pace2 / peis / verb

to walk around in a nervous or angry way

She paced up and down the sidewalk.

рас .i .fi .er

/ ' pressfaisr / noun [count]

a small, rubber object that you put in a baby's mouth to stop it from crying

pack 1 Ф / раек / noun [ count ]

a package or group of things that are sold together a pack of cigarettes

a number of things that are wrapped or tied together The donkey had a heavy pack on its back.

an ice pack

a group of wild dogs or similar animals a pack of wolves

pack 2 ЧР/ раек / verb ( packs, pack . ing, packed)

to put things into a bag, box, etc. before you go somewhere

Have you packed your suitcase? Don't forget to pack your toothbrush.

to put things into a box, bag, etc. Pack all these books into boxes.

—ANTONYM unpack

pack up to stop doing something

At two o'clock we packed up and went home.

pack • ing / ' prekig / noun [ noncount ]

I haven't done my packing and we're leaving tonight.

pack.age О

/ ' p®kid3 / noun [count]

1 something in a box, a bag, or wrapped in paper that is sent by mail

went to the post office to mail a package.

a box, bag, etc. in which things are packed to be sold in a store a package of hamburger buns

—Look at the picture at container .

pack • age verb

(pack•ag•es, pack • ag • ing ,pack•aged )

packaged food

pack • ag • ing / ' p®kid3ig / noun [ noncount ]

material like paper, plastic, etc. that is used to wrap things that you buy or that you send

packed / prekt / adjective

full

The train was packed.

pack • et / ' prekst / noun [ count ]

a small flat bag that contains a small amount of something a packet of sunflower seeds

pact / prekt / noun [ count ]

an important agreement to do something They made a pact not to tell anyone.

pad / pred / noun

[count]

1 a thick flat piece of soft material

Football players wear pads on their shoulders to protect them.

used a cotton pad to clean the cut.

pieces of paper that are joined together at one end a writing pad

pad • ded / ' predsd / adjective

covered with or containing a layer of thick soft material a padded envelope

pad • dle / ' predi / noun

[ count ]

a piece of wood with a flat end, which you use for moving a small boat through water

—Look at the picture at canoe .

pad • dle verb ( pad • dles , pad • dling , pad • dled )

to move a small boat through water with a paddle We paddled up the river.

pad • lock / 'predlak /

noun [ count ]

a lock that you use on things like gates and bicycles