I'm not sure that etym note is really helpful, by the way.

oft. used with this meaning
梅肉エキス　肉エキス　チキンエキス

@@ -18,0 +19 @@
+<gloss>stock</gloss>

OK. I'll put things back and spell it out.

@@ -14 +13,0 @@
-<xref type="see" seq="2168240">エキストラクト</xref>
@@ -16 +15,2 @@
-<misc>&abbr;</misc>
+<s_inf>abbr. of "extract", not エキストラクト</s_inf>
+<lsource xml:lang="dut"/>

daijs: "(オランダ)extract（抽出物、の意）から"
koj: "extract(オランダ)の略。抽出物・浸出物の意"
meikyo "extract(オランダ)から。抽出物の意"

I'll repeat what I said before. I don't see how this can be tagged as an abbreviation when none of the dictionaries (kokugos or JEs) have an エキストラクト entry.
The etymological notes in the kokugos make it quite clear that エキス is an abbreviation of "extract", not エキストラクト.
By having an abbr tag, we're saying that エキス is the shortened form of エキストラクト, which isn't true.
エキストラクト is also used in Japanese but it came later.

actually, never mind on the note.  i see we have an x-ref to the full form which has the dutch language tag

koj, daij, eiki, gg5

perhaps a note for the lsrc such as [note="abbr. of エキストラクト, from the Dutch \"extract\""], although it is arguably unneeded

i also think the kana here are wacky.  currently it's arranged the same way that we do japanese species names.  but the correct way of writing this is エキス (as in all dictionaries), and 越幾斯 is ateji for エキス, so it shouldn't take a nokanji tag.  i see no relevant google image hits for えきす so i am removing it, but if it's needed, it should be a secondary reading, since it's clearly much much less common than エキス

@@ -9,3 +8,0 @@
-<reb>えきす</reb>
-</r_ele>
-<r_ele>
@@ -13 +9,0 @@
-<re_nokanji/>
@@ -21 +16,0 @@
-<lsource xml:lang="dut"/>

Daijr: 〔エキストラクト（オランダ extract）の略〕

With that note in Daijirin (which I didn't notice last year) I think the abbr and xref can 
go back in. I also think the lsrc can be dropped here.

@@ -17,0 +18 @@
+<xref type="see" seq="2168240">エキストラクト</xref>
@@ -19 +20 @@
-<s_inf>abbr. of "extract"</s_inf>
+<misc>&abbr;</misc>

リーダーズ+プラス has エキストラクト.

None of my refs have エキストラクト so I don't think the x-ref or abbr tag is appropriate.
It derives from "extract" but it's not an abbreviation in Japanese.

@@ -18 +17,0 @@
-<xref type="see" seq="2168240">エキストラクト</xref>
@@ -20,2 +19,3 @@
-<misc>&abbr;</misc>
-<gloss>extract (esp. of food, fruit, etc.)</gloss>
+<s_inf>abbr. of "extract"</s_inf>
+<lsource xml:lang="dut"/>
+<gloss>extract (of plants, meat, etc.)</gloss>

a japanese abbreviation, not a foreign one.  therefore, not grg

@@ -14,1 +14,1 @@
-<re_pri>gai1</re_pri>
+<re_pri>spec1</re_pri>