h bloom

Collins
World English Dictionary
bloom1 (bluːm)
 
n
1.  a blossom on a flowering plant; a flower
2.  the state, time, or period when flowers open (esp in the phrases in bloom, in full bloom)
3.  open flowers collectively: a tree covered with bloom
4.  a healthy, vigorous, or flourishing condition; prime (esp in the phrase the bloom of youth)
5.  youthful or healthy rosiness in the cheeks or face; glow
6.  a fine whitish coating on the surface of fruits, leaves, etc, consisting of minute grains of a waxy substance
7.  any coating similar in appearance, such as that on new coins
8.  ecology a visible increase in the algal constituent of plankton, which may be seasonal or due to excessive organic pollution
9.  Also called: chill a dull area formed on the surface of gloss paint, lacquer, or varnish
 
vb
10.  (of flowers) to open; come into flower
11.  to bear flowers; blossom
12.  to flourish or grow
13.  to be in a healthy, glowing, or flourishing condition
14.  (tr) physics to coat (a lens) with a thin layer of a substance, often magnesium fluoride, to eliminate surface reflection
 
[C13: of Germanic origin; compare Old Norse blōm flower, Old High German bluomo, Middle Dutch bloeme; see blow³]

bloom2 (bluːm)
 
n
1.  See also billet a rectangular mass of metal obtained by rolling or forging a cast ingot
 
vb
2.  (tr) to convert (an ingot) into a bloom by rolling or forging
 
[Old English blōma lump of metal]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

bloom
c.1200, a northern word, from O.N. blomi "flower, blossom," also collectively "flowers and foliage on trees;" from P.Gmc. *blomon (cf. O.S. blomo, Du. bloem, Ger. Blume, Goth. bloma), from PIE *bhle- (cf. O.Ir. blath "blossom, flower," L. flos "flower," florere "to blossom, flourish"), extended form
of *bhel- "to thrive, bloom, sprout" (see bole). O.E. had cognate bloma, but only in the figurative sense of "state of greatest beauty;" the main word in O.E. for "flower" was blostm (see blossom). Related to O.E. blowan "to flower" (see blow (v.2)).

bloom
"rough mass of wrought iron," from O.E. bloma, of unknown origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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