The Collaborative International Dictionary of English v.0.48:

Poplar \Pop"lar\, n. [OE. popler, OF. poplier, F. peuplier, fr.
   L. populus poplar.] (Bot.)
   1. Any tree of the genus Populus; also, the timber, which
      is soft, and capable of many uses.
      [1913 Webster]

   Note: The aspen poplar is Populus tremula and Populus
         tremuloides; Balsam poplar is Populus balsamifera;
         Lombardy poplar (Populus dilatata) is a tall, spiry
         tree; white poplar is Populus alba.
         [1913 Webster]

   2. The timber of the tulip tree; -- called also white
      poplar. [U.S.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

poplar
    n 1: soft light-colored non-durable wood of the poplar
    2: any of numerous trees of north temperate regions having light
       soft wood and flowers borne in catkins [syn: poplar,
       poplar tree]

The Free On-line Dictionary of Computing (30 December 2018):

Poplar

   Morris, 1978.  A blend of LISP with SNOBOL4 pattern matching
   and APL-like postfix syntax.  Implicit iteration over lists,
   sorting primitive.  "Experience with an Applicative
   String-Processing Language", J.H. Morris et al, 7th POPL, ACM
   1980, pp.32-46.


Easton's 1897 Bible Dictionary:

Poplar
   Heb. libneh, "white", (Gen. 30:37; Hos. 4:13), in all
   probability the storax tree (Styrax officinalis) or white
   poplar, distinguished by its white blossoms and pale leaves. It
   is common in the Anti-Libanus. Other species of the poplar are
   found in Palestine, such as the white poplar (P. alba) of our
   own country, the black poplar (P. nigra), and the aspen (P.
   tremula). (See WILLOW.)


U.S. Gazetteer Places (2000):

Poplar, WI -- U.S. village in Wisconsin
   Population (2000):    552
   Housing Units (2000): 222
   Land area (2000):     11.922486 sq. miles (30.879095 sq. km)
   Water area (2000):    0.012900 sq. miles (0.033412 sq. km)
   Total area (2000):    11.935386 sq. miles (30.912507 sq. km)
   FIPS code:            63975
   Located within:       Wisconsin (WI), FIPS 55
   Location:             46.582014 N, 91.793712 W
   ZIP Codes (1990):     54864
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Poplar, WI
    Poplar


U.S. Gazetteer Places (2000):

Poplar, MT -- U.S. city in Montana
   Population (2000):    911
   Housing Units (2000): 350
   Land area (2000):     0.267472 sq. miles (0.692750 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.267472 sq. miles (0.692750 sq. km)
   FIPS code:            58975
   Located within:       Montana (MT), FIPS 30
   Location:             48.109474 N, 105.194891 W
   ZIP Codes (1990):     59255
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Poplar, MT
    Poplar


U.S. Gazetteer Places (2000):

Poplar-Cotton Center, CA -- U.S. Census Designated Place in California
   Population (2000):    1496
   Housing Units (2000): 367
   Land area (2000):     1.275894 sq. miles (3.304549 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.275894 sq. miles (3.304549 sq. km)
   FIPS code:            58191
   Located within:       California (CA), FIPS 06
   Location:             36.053936 N, 119.144796 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Poplar-Cotton Center, CA
    Poplar-Cotton Center
    Poplar, CA
    Poplar