pt -abbr

  1. part
  2. patient
  3. payment
  4. pint
  5. point
  6. port

Pt -symbol

  1. platinum

PT -abbr

  1. Pacific time
  2. part-time
  3. physical therapist; physical therapy
  4. physical training

pta -abbr

  1. peseta

PTA -abbr

  1. Parent-Teacher Association

ptar·mi·gan ['tär-mi-gən] -n

  1. any of various grouses (genus Lagopus) of northern regions with completely feathered feet

PT boat [,pē-'tē-, 'pē-,] -n

  1. a small fast patrol craft usu. armed with torpedoes, machine guns, and depth charges called also PT

PTC [,pē-(,)tē-'sē] -n

  1. phenylthiocarbamide

pte -abbr

  1. private

pter·an·o·don [tə-'ra-nə-,dän, -'rä-] -n

  1. any of a genus ( Pteranodon) of Cretaceous pterosaurs having a backwardly directed bony crest on the skull and a wingspan of about 25 feet (7.7 meters)

pterid- -comb form

  1. fern
    • pterido logy

pter·i·dine ['ter-ə-,dēn] -n

  1. a yellow crystalline bicyclic base C 6H 4N 4
  2. any of a class of compounds (as the pterins) that have the bicyclic ring system of pteridine and include esp. various animal pigments

pter·i·dol·o·gy [,ter-ə-'dä-lə-jē] -n, adj

  1. the study of ferns

pte·ri·do·phyte [tə-'ri-də-,fīt, 'ter-ə-dō-] -n

  1. any of a division (Pteridophyta) of vascular plants (as a fern) that have roots, stems, and leaves but lack flowers or seeds

pte·ri·do·sperm [tə-'ri-də-,spərm, 'ter-ə-dō-] -n

  1. seed fern

pter·in ['ter-ən] -n

  1. any of various compounds that contain the bicyclic ring system characteristic of pteridine

ptero·dac·tyl [,ter-ə-'dak-tᵊl] -n

  1. any of various pterosaurs (suborder Pterodactyloidea) of the Late Jurassic and Cretaceous having a rudimentary tail and a beak with reduced dentition
  2. pterosaur

ptero·pod ['ter-ə-,päd] -n

  1. any of the opisthobranch mollusks comprising two orders (Thecosomata and Gymnosomata) and having the anterior lobes of the foot expanded into broad thin winglike swimming organs

ptero·saur ['ter-ə-,sȯr] -n

  1. any of an order (Pterosauria) of extinct flying reptiles existing from the Late Triassic throughout the Jurassic and most of the Cretaceous and having a featherless wing membrane extending from the side of the body along the arm to the end of the greatly elongated fourth digit

pter·o·yl·glu·tam·ic acid [,ter-ə-,wil-glü-'ta-mik-] -n

  1. folic acid

pte·ryg·i·um [te-'ri-jē-əm] -n

  1. a fleshy mass of thickened conjunctiva that grows over part of the cornea usu. from the inner side of the eyeball and causes a disturbance of vision

pter·y·goid ['ter-ə-,gȯid] -adj

  1. of, relating to, or lying in the region of the inferior part of the sphenoid bone of the vertebrate skull

pterygoid -n

  1. a pterygoid part (as a bone, muscle, or nerve)

pterygoid process -n

  1. a process extending downward from each side of the sphenoid bone in humans and other mammals

pter·y·la ['ter-ə-lə] -n

  1. one of the definite areas of the skin of a bird on which feathers grow

ptg -abbr

  1. printing

PTO -abbr

  1. Parent-Teacher Organization
  2. please turn over
  3. power takeoff

Ptol·e·ma·ic [,tä-lə-'mā-ik] -adj

  1. of or relating to the second century geographer and astronomer Ptolemy of Alexandria and esp. to his belief that the earth is at the center of the universe with the sun, moon, and planets revolving around it
    • the Ptolemaic system
  2. of or relating to the Greco-Egyptian Ptolemies ruling Egypt from 323 to 30 b.c.

pto·maine ['tō-,mān, tō-'] -n

  1. any of various organic bases which are formed by the action of putrefactive bacteria on nitrogenous matter and some of which are poisonous

ptomaine poisoning -n

  1. food poisoning caused by bacteria or bacterial products

pto·sis ['tō-səs] -n

  1. a sagging or prolapse of an organ or part
  2. a drooping of the upper eyelid

PTSD -abbr

  1. post-traumatic stress disorder

PTV -abbr

  1. public television

Pty -abbr

  1. proprietary

pty·a·lin ['tī-ə-lən] -n

  1. an amylase found in the saliva of many animals that converts starch into sugar

pty·a·lism [-,li-zəm] -n

  1. an excessive flow of saliva

ptype ['pē-,tīp] -adj

  1. relating to or being a semiconductor in which charge is carried by holes