Definition of "glowworm"

The glowworm shows the matin to be nearAnd ’gins to pale his uneffectual fire.Adieu, adieu, adieu! Remember me.

c. 1599–1602 (date written), William Shakespeare, “The Tragedie of Hamlet, Prince of Denmarke”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act I, scene v]

Some things afarre doe like the Glow-worme shine, / That lookt to neere haue of that light no signe.

1604, William Alexander, The Alexandraean Tragedie, Act V, Scene 2, in The Monarchicke Tragedies, London: Ed. Blount, 1607

Glories (like glowe-wormes) a farre off, shine bright,But look’d to neere, haue neither heate, nor light.

1612–1613 (date written), John Webster, The Tragedy of the Dutchesse of Malfy. […], London: […] Nicholas Okes, for Iohn Waterson, […], published 1623, (please specify the page)

Ye Glo-worms, whose officious FlameTo wandring Mowers shows the way,That in the Night have lost their aim,And after foolish Fires do stray;

1681, Andrew Marvell, “The Mower to the Glo-Worms”, in Miscellaneous Poems‎, London: Robert Boulter, page 44

Confiding Glow-worms, ’tis a night / Propitious to your earth-born light!

1819, William Wordsworth, “The Waggoner” Canto 1, in The Miscellaneous Poems of William Wordsworth, London: Longman, Hurst, Rees, Orme & Brown, 1820, p. 7

Young girls lie bedded soft or glide in their dreams, with rings and trousseaux, bridesmaided by glowworms down the aisles of the organplaying wood.

1954, Dylan Thomas, Under Milk Wood‎, New York: New Directions, page 1