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Do all things that are tamei have to be more than an adasha or just a sheretz? for example is less than an adasha of zera tamei?

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    Consider dejargonifying this. Consider also providing background for your statements. Where did you encounter adasha? – mevaqesh Apr 21 '17 at 20:28
  • See Hilkhot Shar Avot HaTum'ot (5:1-2) שכבת זרע--אב מאבות הטומאות... ב וכמה שיעורה--לנוגע, בכעדשה; ולרואה, בכל שהוא. To become impure by touching zera one would need the amount of an adasha. To become impure by ejaculating it, any amount would suffice. – mevaqesh Apr 21 '17 at 20:34
  • Welcome to MY! As @mevaqesh pointed out, we try to avoid jargon without explaining, and we try to insert sources for any of our statements. Hope to see you around! – DonielF Apr 21 '17 at 20:38
  • Welcome to Mi Yodeya Anonymous! Consider registering your account. – mevaqesh Apr 21 '17 at 20:50
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There is no general rule. Some things need a minimum of a lentil's worth, some a barley's worth, some an olive's worth, etc. You just need to check each case. For example, check out Mishna Ahilot Chapter 2 for various minimum sizes related to corpse-impurity.

Regarding your specific example, yes, the minimum size of semen to impart impurity is a lentil's worth (Rambam Shear 5:2).

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    What is "Rambam Shear"? – David Kenner Apr 21 '17 at 23:28
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    @DavidKenner - I think he means She'ar Avot HaTum'ah by the Rambam. – ezra Apr 22 '17 at 0:14
  • @ezra sounds correct. TY. Then it should be 5:1. – David Kenner Apr 23 '17 at 1:10

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