jmdict 1594790 Active (id#2335231)
週齢； 週令； 週齡 [sK]
【 しゅうれい 】
  1. [n,suf]
    • week-old
History:
    • A 2025-03-25 23:09:03 Jim Breen (id#2335231)
    • A* 2025-03-25 22:39:32 Stephen Kraus (id#2335222)
    • Refs
      Daijisen: しゅう‐れい【週齢】胎児・幼児などの成長を、7日を1期として数える数え方。「生後3―」

Google N-gram Corpus Counts
╭─ーーーーー─┬────────┬───────╮
│ 週齢　　　 │ 23,939 │ 75.2% │ - add
│ 週令　　　 │  2,541 │  8.0% │
│ 週齡　　　 │    145 │  0.5% │ - sK (kyuujitai form of 週齢)
│ しゅうれい │  5,205 │ 16.4% │
╰─ーーーーー─┴────────┴───────╯
    • Diff
      @@ -3,0 +4,3 @@
+<k_ele>
+<keb>週齢</keb>
+</k_ele>
@@ -8,0 +12 @@
+<ke_inf>&sK;</ke_inf>
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