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ox·i·da·tion noun : the act or process of oxidizing; also : the condition of being oxidized

— ox·i·da·tive adjective

ox·ide noun : a compound of oxygen with another element or group

ox·i·dize verb -dized; -diz·ing : to combine with oxygen

— ox·i·diz·er noun

oxidizing agent noun : a substance (as oxygen or nitric acid) that oxidizes by taking up electrons

ox·y·gen noun [ORIGIN: F oxygène, fr. Gk oxys acidic, lit., sharp + -genēs giving rise to; so called because it was once thought to be an essential element of all acids]

: a colorless odorless gaseous chemical element that is found in the air, is essential to life, and is involved in combustion

ox·y·gen·ate verb -at·ed; -at·ing : to impregnate, combine, or supply with oxygen

— ox·y·gen·a·tion noun

oxygen mask noun : a device worn over the nose and mouth through which oxygen is supplied

oxygen tent noun : a canopy which can be placed over a bedridden person and within which a flow of oxygen can be maintained

ox·y·mo·ron noun : a combination of contradictory words (as cruel kindness)

oys·ter noun : any of various marine mollusks with an irregular 2-valved shell that include commercially important edible shellfish and pearl producers

— oys·ter·ing noun

— oys·ter·man noun

oz abbreviation [ORIGIN: obs. It onza (now oncia)]

ounce; ounces

ozone noun 1 : a bluish gaseous reactive form of oxygen that is formed naturally in the atmosphere and is used for disinfecting, deodorizing, and bleaching

2 : pure and refreshing air

ozone layer noun : an atmospheric layer at heights of about 25 miles (40 kilometers) with high ozone content which blocks most solar ultraviolet radiation

P

1p noun, plural p's or ps often cap : the 16th letter of the English alphabet

2p abbreviation, often cap 1 page

2 participle

3 past

4 pawn

5 pence; penny

6 per

7 petite

8 pint

9 pressure

10 purl

P symbol phosphorus

pa noun : a man who has begotten a child : FATHER

1Pa abbreviation 1 pascal

2 Pennsylvania

2Pa symbol protactinium

1PA noun : PHYSICIAN'S ASSISTANT

2PA abbreviation 1 Pennsylvania

2 per annum

3 power of attorney

4 press agent

5 private account

6 professional association

7 public address

8 purchasing agent

pab·u·lum noun [ORIGIN: L, food, fodder]

: usu. soft digestible food

Pac abbreviation Pacific

PAC abbreviation political action committee

1pace noun 1 : rate of movement or progress (as in walking or working)

2 : a step in walking; also : a measure of length based on such a step

3 : GAIT; especially : a horse's gait in which the legs on the same side move together

2pace verb paced; pac·ing 1 : to go or cover at a pace or with slow steps

2 : to measure off by paces

3 : to set or regulate the pace of

Synonyms

file, march, parade, stride—more at MARCH

3pace preposition : contrary to the opinion of

pace·mak·er noun 1 : one that sets the pace for another

2 : a body part (as of the heart) that serves to establish and maintain a rhythmic activity

3 : an electrical device for stimulating or steadying the heartbeat

pac·er noun 1 : a horse that paces

2 : PACEMAKER

pachy·derm noun [ORIGIN: F pachyderme, fr. Gk pachydermos thick-skinned, fr. pachys thick + derma skin]

: any of various thick-skinned hoofed mammals (as an elephant)

pach·ys·an·dra noun : any of a genus of low perennial evergreen plants used as a ground cover

pa·cif·ic adjective 1 : tending to lessen conflict

2 : CALM, PEACEFUL

Synonyms

conciliatory, propitiatory; also endearing, ingratiating; peaceable, peaceful; nonbelligerent, unaggressive, unassertive; calming, comforting, quieting, soothing; obliging, satisfying; affable, amiable, amicable, benevolent, gentle, kind, kindly; submissive, surrendering, yielding

Antonyms

antagonizing

pac·i·fi·er noun : one that pacifies; especially : a device for a baby to chew or suck on

pac·i·fism noun : opposition to war or violence as a means